R.M. It's a 10mm tilt either way. doesn't sound much, but it tilts the coil by about 60mm. which is a huge amount when detecting. It's the same with the Minelab and X coils. It seems there is wear? between the middle shaft and the control box shaft. I'll dismantle it all shortly to check it out. It might need a couple of shims on the shaft that slots into the control box. There's no fracture in the visible part of the shaft, and it feels firm. So much for the easy fix I was hoping for. It's got to be fixed, as stopping all the time to right it affects my detecting rhythm.