After using a GPX 4500 for a few years I was reading and watching videos of the new Garrett ATX. I was most impressed by how quiet it was dealing with hot rocks. I ordered one from Arizona Outback and received it in a couple of days. I always get excellent service from them. Through the holidays practicing in the yard and a quick trip to a gold location I noticed something didn't feel right. Thoughts came to me like maybe i should have kept my 4500. The ATX handled the hot basalt cobbles and boulders a lot better than my 4500, but the coil was awkward getting around and in between them. After getting home reading some posts on here about using a garrett 5"x 10" infinium DD coil on the ATX, I ordered one. Next came how to mount it. I wanted to use the same rod so i had to come up with a way to have a quick release so i could use both coils. After some engineering problems, I have modified my ATX. So if i want to go back to the stock coil all i have to do is undo the coil quick disconnect then connect the other coil. The last thing that i did was sew a control box cover to protect it. The weight is another issue I'll work out before i head up to Randsburg area next weekend.