I use the lobo coil, stock, and just picked up the small concentric. I should clarify...I use the Tejon alot, but pretty much always for relics. I did give it a go for prospecting once, due yo circumstances,and I go to all metal often just to cover ground quickly to look for iron infested spots. Yes, that ground balance is touchy.
Well...........I guess great minds think alike
Mines not as short but the mod is good.
I moved the coil till the GB2 started making noise then backed it off a couple inches when I made it.
And, that's SPACE AGE PLASTIC!!!! Not schedule 40 PVC
Tom H.