Blue, You talking about the lock ring? Is it the varizone?
When you have an issue with the lock ring you can find where it needs to be set for focus, loosen the ocular, tighten the lock ring as tight as you can, then grab the ocular, hold the lock ring, and bare down on the ocular until it gets to the proper position. It's the best way I've found to really lock them down.
I have the varizone on one of my rigs and find it to be a pretty decent scope.
