Jump to content
Steve Herschbach

Wore Out GPZ Skidplate - Anyone Tried The Razorback?

Recommended Posts

Thanks Rob, good to know. I hope business is great but do smell the roses when you can! Say hi to Dawn and Dennis for me.

Welcome to the forum Keith! To be honest you got the benefit of a good Google response. Interesting to see an east coast dealer stocking GPZ accessories. Are they seeing any use outside the prospecting world? Seems like the extreme sensitivity to tiny ferrous stuff would be an issue, but that is all high tones. Dig low tones only might work in certain relic hunting situations but unfortunately that trick would be no good nugget hunting.

Share this post

Link to post
Share on other sites

Steve, I use two part Epoxy all the time and for the longest time mix it on a six

inch square of cardboard, I just cut off a 2x3 inch piece of cardboard to use as

a mixer, spatula..

The whole point is to this, I would take that disk (coil cover) clean it good, 409,

or Denatured Alcohol, put a couple of two inch circles two part epoxy on the

disk, mix and spread. These two bottles will last forever.


Epoxy  this stuff is the best, about 20 minute. 15 bucks


  • Like 2

Share this post

Link to post
Share on other sites


Thank you for the welcome! I'll be sure to stop by from time to time... :)

We do keep some of the GPZ accessories on hand, as there are a few of these machines on the east coast.... Plus with the website a customer can pop up from anywhere at any time. :)

It's tough to use the GPZ in the Civil War camps... But it can be done. Without iron reject all those tiny surface nails not heard when using the GPX can overwhelm a user swinging the GPZ. But if you can get in the areas where the targets have been thinned out, with a bit of paitence some deeper relics can be found.... Such as the confederate camps where guys typically dig just about every signal. At the DIV last spring I did find quite a few relics with it, but most of those low tones which are bullets. When you do go over a bullet with the GPZ, there is no doubting it. The prized buttons come in nice and loud as a high tone when you get over one.... But as you noted so does the shallow small iron. At the end of the week I was starting to figure out the tones, but it's tough to discern which signals are worth digging and which ones to pass.

At this time, for the vast majority of relic hunters will not have the paitence to use a GPZ, and opt to keep swinging a GPX for best results. But there are a few who will adopt it. I know of one fellow (a non-dealer) taking a new one to the fall DIV.... And I'll be curiously watching his results. Long term I don't see a large group of relic hunters adopting this machine, but there will be a select few that figure out how to harness it to work for them.

  • Like 1

Share this post

Link to post
Share on other sites

Well, I have been getting in the hours and have wore out my GPZ 7000 scuff cover / coil cover / skidplate.


New genuine Minelab covers are like everything else GPZ rare as hen's teeth. Part number 3011-0286 and very few places on the internet can be found that advertise having them in stock. $62 retail, and Ft. Bedford claims to have them in stock for $48 http://www.fortbedfordmetaldetectors.com/minelab-gpz7000-14x13-coil-cover


Miner John has an aftermarket coil at http://razorbackcoils.webs.com/apps/webstore/products/show/5908106 that Chris alerted us to back in May http://www.detectorprospector.com/forum/topic/930-gpz-7000-coil-cover-available/ for about the same price. It is twice as thick and has fewer slots that would let dirt get in between the coil and scuff cover. Has anyone tried these out and can report on them?

Steve and all,


Having worn out the stock GPZ 7000 skid-plate in relatively very short order (No, I am not a scuffer) and seeing how thin the coil itself is, I purchased the Miner John Designs GPZ coil cover out of necessity.


IMHO this Miner John 7000 cover is the best investment that can be made to protect this effective, but costly, detecting unit. This skid-plate is “Tank Tough” and swinging one of the heavier detectors on the market, the weigh is not an issue at all. It's heavy duty design does not affect sensitive or performance in any way with the finding of nuggets at depth to prove it.


As for the slots on the edge of the Super D, I really think that Minelab lay-out of the coil's edges was to ensure that they would be the only game in town. The Miner John Designs GPZ coil cover far exceeds the manufacture's best efforts, period. The Cover stays snug and does not allow dirt to get inside and some would want you to believe.


I pose a very important question to those that have a GPZ and use their 7000 a great deal:


Knowing how thin the stock cover is and how quickly they disintegrate, why would you keep beating your head against the wall by purchasing a “dollar store trash can lid” over and over again when you could have a heavy duty cover to protect a primary part of an expensive detecting device?



  • Like 1

Share this post

Link to post
Share on other sites

OK, I had a spare Minelab skid plate and Miner John was kind enough to send me one of his. And just so people know the one Doc sells is made by Miner John - Doc just slaps his own sticker on them.

It is fairly simple. Almost all scuff covers are made of the same fairly stout plastic. For some reason on the SDC 2300 and GPZ 7000 Minelab has gone to a soft plastic (polypropylene?) which is about the same stuff as makes up an old style coffee can lid. It is flexible and soft and wears quickly.

The Miner John seems barely any thicker but it is the standard skid plate material we are all used to. Quite stout and will barely flex at all. There is extra material there however. The Minelab cover weighs 4.3 ounces while the Miner John cover weighs 7.4 ounces.

The Minelab brand cover must be aligned perfectly to get on but goes on easy enough. However, if you look at the picture below closely you can see stress marks at each notch where the plastic stretched and in a couple spots looked close to splitting just putting it on.


The Miner John version went on easy enough until the last notch. I just pushed a bit harder and it popped on, no tools needed, but some may want to use a screwdriver or butter knife to ease that last notch over the edge of the coil.

The Miner John is about 1/4" to 3/8" higher that the Minelab version. No doubt a bit of the extra weight creeps in here. This is also good in that it protects the sides of the coil better, but bad in that it creates a channel around the edge to collect fine silt, which can then work down into the space between cover and coil. I doubt it will be much of an issue however and I honestly never had much problem in that regard with the Minelab cover either.

My personal take given that both these covers cost about the same in the United States is that the Miner John is the far better buy. It is bound to last much longer, easily twice as long or more I am guessing. The Minelab cover does weigh less and if you keep the coil suspended over the ground that might matter. But then you really do not need a heavy duty scuff cover anyway. Mine rides on the ground so the extra weight won't matter. For somebody really using the GPZ a lot it will add up in savings over time. We will see. I will use the Miner John and keep the Minelab cover for backup.


Share this post

Link to post
Share on other sites

I used the Miner John skid plate on my last trip. I did not notice any difference in sensitivity to small targets and yes it is nice and thick so I feel that it protects the coil better then the standard skid plate. When I took it off after the trip there was barely any dirt inside so I was happy with that. The stock skid plate accumulated lots of dirt and I used to take it off at the end of the day to clean it. As stated earlier my problem with the Miner John was that I could not get it on without heating the tabs with a heat gun and bending them out a little. I tried using a screw driver to pry out the tabs but I did not like the way it was putting pressure on my $10,000 metal detectors coil. The plastic on the ZED  coil is not much thicker the that on the standard skid plate. Maybe I got one that was extra tight fitting I don't know. Once you get the Miner John on its great. Maybe it will soften up with use and be easier to get on and off.



Share this post

Link to post
Share on other sites

Steve; in your opinion would using silicon-stuff to seal the dust out of the Minerjohn coils be a reasonable option. I have always used sealant on my vlf coils and some of the Minelab pi coils....these new spider-web and notched coils are another world...to me.


I have a ways to go before I wear out my gpz cover but it will happen.



Share this post

Link to post
Share on other sites

Thanks for the update Steve, The soft stock coil cover doesnt add any real strength, and if your a ground scrubber, at least for me,  the coil falses sometimes from the deflection caused by bumping and  scrubbing on rough terrain. Sounds like these are the ticket.

Share this post

Link to post
Share on other sites

Fred, sealing the edges is an option but I do not know there is a problem to fix yet for sure. I doubt it really and strick says no. I will know soon and will report back.

Share this post

Link to post
Share on other sites

I don't see a big difference between the dirt that gets in your scuff cover and the dirt you're swinging your coil over on the ground. It's all dirt...

Unless you get a bunch of black sand in there maybe.

  • Like 1

Share this post

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Similar Content

    • By PeterInSa
      Currently using an SP01 and matching twin Speakers, volume on the Z is 8 volume on Sp01 around 7.5 if not using the Sp01 Volume on the  Z is 11, with these settings and my hearing am not sure am getting the benefit of the Sp01, so as above would appreciate comments on twin WM12's ( Speakers are high on the Z Harness along with the WM12, the SP01 in the Z Harness backpack) 
      Will look at setting up the SP01 and the Twin Speakers on Margaret's 2300 with a Transmitter/Receiver driving the Sp01.
    • By phrunt
      I was very keen to go for a gold detect this weekend, only problem is the weather forecast wasn't really detecting weather, I wanted to go back to the spot I did very well last weekend where I found .865 of a gram  I just had a funny feeling there was more in that hole as I was getting faint signals with the GPZ but at the time I wasn't sure if that was just the hot rocks, this particular spot is full of hot rocks of all shapes and sizes, right down to pea size up to giant bolder.  I was hoping my assumption there might be more gold there would be correct.
      There was quite a bit of snow overnight but the skies had cleared and went nice and blue so I sent JW a text message asking what the weather was doing up his way seeing he lives 10 minutes from where I was going to look for my gold.  He responded it wasn't looking too good so he will decide when I arrive if he wants to go detecting.   Nothing was stopping me however, I had a mission and I was determined to find gold!
      About 10 minutes after I left my house things went downhill with the snow

      Started to get pretty thick, fortunately they'd plowed the road but it was still slowing coming down.
      Then up ahead the traffic was all at a stop, by traffic I mean the one car in front of me 🙂  It was due to a car that thought it would be wise to tow a caravan in the snow.  Not a good idea, the road was icy and slippery.

      Things did not go well for them, they lost control, spun around and their caravan basically exploded.

      Not much left of it.  Further up the road the weather was getting worse, and I'd forgot to put my chains in the car, if it got too bad I'd have to turn back.

      After a bit more driving as I got towards the lake nearer to JW's house the skies cleared and there was no snow up that way.

      I stopped at the shops to get a few things and picked up a tool from the hardware store expecting to have to smash through rock to recover nuggets like JW has been doing.  That seems to be the way nuggets are mostly found at this spot, my nugget in the hole last weekend was a bit unusual.  JW always goes straight to detecting the rock where he's doing very well, 10 or so little nuggets most days.  I got to JW's and he decided the weather was good enough so off we went.  JW went to his rock wall again, that thing just keeps on giving.... and I went to my hole.
      It was not long at all and I had my first nugget, then another.... and another, they just kept coming.  The damp soil I suspect was making them stand out even more, both JW and I have noticed this in the past, they light up in wet soil.

      I had my first 3 within about 30 minutes I would guess... I took my watch off during the virus lock down as I never needed to know the time anymore and I've never put it back on.  I got used to not caring what time it is.  That little guy is 0.034 of a gram, and the 10" X-coil found it with no troubles at all.  I run my GPZ in HY Norrmal, Manual GB with gain on maximum, all else defaults.  I don't bother with the little yellow ferrite ring, I feel it doesn't help at all in our soil.  I don't understand Minelab's decision not to make a small coil, they probably don't even know the full potential of the GPZ on small gold as with a small coil it's absolutely deadly, the tiniest bits very comparable to a high frequency VLF like the Gold Monster.  I think with the 8" coil it will easily match the Gold Monster.  I think they didn't want to take the SDC 2300's market away from the GPZ owners, they'd rather sell them a second detector than a coil - more profit!

      And here is a video of the detector response on that tiny little nugget, insanely sensitive.  I can't wait for my 12x8" and 8" round to arrive, you would think it would not be possible to get more sensitive than the 10".
      This was my first time finding one so tiny with the GPZ, JW does it all the time and I was watching him do it last weekend so I was using that as a learning experience of what to listen for.

      I just kept scraping more off the hole in layers, I was having a bit of trouble with tiny hot rocks but I didn't want to change off HY normal / max gain to calm the hot rocks down so I just kept fishing them out whenever there was one there and throwing them far away, often using the Nox to assist with narrowing their location down.
      During my digging I found a weird little skull, maybe a dinosaur 🙂

      There was other bones right next to my hole too, perhaps an animal had been using my hole as it's dining room.

      The gold didn't stop coming, I've never had a day like this, I had so many bits by now I had lost count, I didn't even bother taking photos as that would waste valuable digging time.  I just kept scraping more away and detecting each layer after removing the hot rocks by using the Equinox with 6" coil and picking out any rock that it detect as a hotrock (-8/-9).... If you've got good gold eyes you may spot the bit of gold in the photo below, I spotted it sitting in my scrape.

      And this was it.

      I got to the point a big rock was in my way so I had to swing around and attack it from the other side where the sticks are

      This side was a bit wild, you can now see how much I've dug out, the original ground layer, it was on a downhill slope.  right up where a tree root was I had a really nice signal with the GPZ, it was too loud so I thought perhaps a bullet or something so I grabbed the Equinox to see what it would come up with, it had no signal.
      I removed a bit more soil then suddenly I had a solid 16.  I used the Equinox to recover the target and to my surprise.........  The biggest nugget I've ever found!!!!!!!!!!
      Oh yea! a beauty.  You'll see up above that my little tiny bottle, it's my emergency bottle that I keep inside the zipped up GPZ cover as I have forgotten to bring a bottle a few times I keep that little guy as my spare.  Fortunately I did as I sure needed it on this day.
      I took the following photo today as I went back today to hunt the spot again, this photo shows exactly where I found the big nugget.

      It was on top of that rock below the tree root.
      I found a few more nuggets, another 4 I think after the big one but I didn't take any photos, it was starting to get dark so I met back up with JW to see how he'd done on his rock wall, he'd got 9 nuggets, not bad! He was impressed with my whopper and my haul, it is a very big nugget for NZ.
      We walked the 20 or so minute hike back to the car but as we got close to the car for some reason I checked my pocket to see if my gold was there, and it wasn't! $#@$#@$#@ My heart stopped! We went into panic mode checking my pockets 20 times and emptying out my backpack, nope! Nowhere, it was very dark now and my phones light wasn't helping much.  We decided rather than walk back with my phone light we'd go back to JW's house and get a torch and come back and look for it, it either had to be on the path we took or any of the last areas we walked at the nugget spot.  We arrived back with the Torch, JW was a lot more confident we'd find it than I was.  He said we'd be best off going back to the spot as it likely fell out of my pocket when I was crouching down packing all my stuff back into my bag.  We retraced our steps back at the nugget spot and within about 10 minutes I spotted it, sitting in the long dead sparse grass!!!  Thank goodness! That was a close call, my best gold day ever and I'd lost it all.
      Now for the weigh in.

      All the little ones, I can't even remember how many, 15  I think it was for 2.113 grams

      And the monster! 4.081 grams!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

      The total for my best day ever,  6.195 grams!
      JW offered for me to stay at his place but I wanted to go home and show my wife my find, I didn't expect my 9 year old daughter to still be awake as I got home about 9.30pm and her bed time is 8.30 but my wife let her stay up to see my big nugget, she was very excited and shocked to see how big it was.
      I had plans to go back first thing in the morning to start again, this hole had to have more, I dug my last one about 5 minutes before stopping last night so I was sure it wasn't finished.  This time I was going to come more prepared, better pants with a zip up pocket to hold my gold bottle and a bigger white bottle so I can't lose it after the previous scare, a crow bar as we call them or San Angelo bar in America I believe? and a big magnet on a pole to try help with the little hot rocks.  The ground was a bit frozen when I arrived but not too bad.

      The magnet on a stick is cool, and worked well, shrinks down to put in my backpack too, it helped clear up the hot rocks quickly.

      A pretty big strong magnet on it.
      I had to give the area a tidy up and clear all the sticks before starting as I was heading that direction with my digging.

      Doesn't help with these giant hot rocks though, but the crow bar dig them out and moved them for me, I'm certain they mask the gold targets when they're nearby
      A quick video of the Nox on the hot rocks
      It came in handy for giving me an ID on them.
      Day two was going well too, I'd lost count again on how many nuggets only taking photos of the bigger ones.

      Quite meaty!

      And another one!

      This rock even had a little one stuck in it.
      I had to be home by 3pm so I called it quits, JW is still there now, hopefully he finds a big one! 🤞
      So my total for today

      11 Nuggets for 3.310 grams, and my two day total

      9.546 grams, what a weekend! I love the 10" X-coil on the GPZ, what a killer combination.  I'm really excited about the smaller sizes coming (8" and 12x8")
    • By fredmason
      I seen this issue on the oz forum...is anyone besides me having a problem with the 12v charger for the gpz?
      I have two- one for my ctx and one for the 7000 and they both behave badly...when I plug one into the 12v outlet in my truck it starts flashing red while charging. The manual says this means there may not be enough battery to pull juice from the truck battery...my truck battery is brand new.
      So, I carry a small invertor and plugged that into the 12v outlet, then the battery charger into the inverter...the charger worked fine but my truck battery was  drawn down and I had to jump it...
      so, the second question is this; does the inverter draw a huge amount of amps to go from 12v to 110v to charge a the zed battery???
      Also, is the sensitivey of the minelab chargers adjustable ????
    • By phrunt
      I have ordered a new size X-coil, it's a 12x8" X-Coil,  It's already in the post however it's delayed in shipping due to international shipping delays the world over.  Hopefully this coil arrives soon. I am very excited about it as I think it will be the perfect size for NZ.
      It's even in NZ's black and white colours.

      This should be good in our rocky terrain on small gold.
    • By phrunt
      I haven't had a chance to go prospecting since our lock down ended a few weeks ago, once lock down ended I was busy catching up on everything that couldn't be done in lock down 🙂 NZ has done a stellar job in eradicating the virus so our lives are essentially back to normal now except for no International tourists which in our part of the country are a big part of our economy.  We haven't had any new cases in some time and there is now only one person left in the entire country that is in quarantine with the virus. 

      The one case left is on the North Island, so no problem for me down the bottom of the South Island 🙂  Every morning lately has been a heavy frost so I was intending to do my gold hunt in the afternoon once the ground thaws out.

      This was my yard before I left.  A bit chilly 🙂
      It was good to get out prospecting again, my wife and daughter wanted to tag along as they were going to ride their bikes along the cycle trails in the area so my day was limited, I only had a couple of hours.  We parked up and I walked to my usual spot and showed them where I'd be so they could come back and find me.  My first target was a shotgun pellet, damn it, I'd forgotten they existed, I had a hard enough time remembering how to use my detector it's been so long 🙂
      I was then walking across to the spot I wanted to have a snoop around and on my walk there I got a signal, it wasn't a booming target and it sounded too good to be a shotgun pellet.  I dug the surface away and the signal was still there, looking positive, it was at this point I took a quick video in case I was lucky enough that after only about 15 minutes I had my first nugget.
      I wasn't too sure on this one as the spot where it was located didn't really feel right, not the usual place we'd been finding gold around this spot so I turned the video off and started the recovery, possibly expecting a deep old bullet shell or something.    It was a really scrubby area too, lots of prickle bushes and old sticks everywhere.  In all of my excitement of my first find of the day I didn't even get a photo of the area, but the video shows it.  I had to dig a fair way down to get to my target, It was stuck in some layers of the rock which I had to smash out to get to it.

      A decent size too! woohooo, what a start.  I like when they're big enough my Carrot narrows them down.

      Just after I'd found the nugget I was rechecking the area and heard a bike pull up, it was JW, we hadn't seen each other in some time due to the lock down but he'd been coming to this spot again the last few weeks once lock down ended.  We had a chat then got stuck back into it, he went to his usual spot where he's been doing very well, and I went back exploring the side I've been attacking.
      No good targets for about 40 minutes now then in between some bedrock I had another nice sounding target that survived a few scrapes of the pick, always promising.

      These small coils are just brilliant for our hunting grounds here, the smaller the coil the better, the small 10" X-coil has brought this old hunted out area back to life as you can get into all these little tight spots and it paid off again, the coil only just fit between these rocks too, there is still a lot of ground the 10" is too big for but it does get a majority of it.

      I'm no photographer 🙂 but in the shadow in front of my coil is the dig hole, right between the two rocks.  A bigger coil would have missed this gold.

      The bedrock is shallow here but I have done this ground with the Equinox a few times and missed this piece.  If you look hard you'll see the crack in the bedrock where it was.

      And the nugget, typical sort of nugget for this area, all water worn looking smooth bits even though none of the rocks around the area are rounded water worn rocks.  
      A few more junk targets and my phone dinged, it was my wife saying shes done bike riding and was on her way back to collect me so I walked over to see how JW was doing.  I had heard him banging away at the rock for ages while I was detecting around so I assumed he'd done well.  When I arrived he was digging out a big hole in the bedrock cliff face, all the soil was out of the crack and he was breaking apart the rock with his screw driver and hammer. So far he had one bit of gold but another signal was in there, so we tried to use my Carrot to narrow it down, no luck so he kept smashing away.

      He had created that big hole, the big bit of rock at the bottom of the photo was from the hole, the rest were thrown down the side off the cliff.

      After smashing some more up and trying to find it he still had no luck so we tried the Carrot again,  this time it picked it up, real good. It sure helped speed up the recovery.

      A big one too! Carrot detectable size again.  Unusual to get biggish ones and now we've both got one!
      He checked the hole again, and another signal

      A tiny one!, Rechecked again...... another signal, unbelievable.  A lot more smashing out of the rock and out it pops

      The hole was getting bigger and bigger

      And more kept popping out.  My wife and daughter arrived on their bikes now to collect me so I called them over to see the hole that keeps giving, it still had a signal in it now that we were working on recovering, each target as needing more rock smashed out

      This 10" Coil can really pick up some incredibly small nuggets.
      And they just kept coming, my family were watching on with interest.  More nuggets kept coming out then JW checked the soil and crumbled up rocks that came out of the hole and more signals, all over the place

      Absolutely nuts, what a hole!

      All from that one hole,all were in the rock needing smashed out.  I had a ball helping with that recovery, 13 nuggets at 1.8 grams total weight.  JW said yesterday he found a similar hole on the same cliff face with 10 pieces in it.

      And my total, sorry for the glary photo, was taken at night once I got home, and the houses LED lights mess up photos.  0.865 grams for 2 nuggets, 0.76 of that is the big one.
      I really love the small GPZ X-coils, I can not wait for my 12x8" X-coil to arrive as it may get into the spots the 10" coil can't.
    • By Steve Herschbach
      U.S. dealers are including the 19” coil free with GPZ 7000 purchases for a limited time. I’m not sure if this is being offered in Australia.

  • Create New...