...then the side turret adjustment fell out.
As an aside, I had a loss of confidence due to this scope-zero was shifting. Thought it was me and not allowing the gun to recoil cleanly. Tried everything until, fed up, I put the thing on a bench. Clearly there was a problem, groups everywhere, but mainly (but not always) up and to the right.
Replaced it with an AGS 40x6 fixed mag and all is now well.
Very well in fact!