Thanks for the explanation! If I read it right, you are saying that even though the screws don't loosen, the metal they are holding stretches and gives the same effect as loose screws? Makes sense to me. also is a possible answer to something that happened to me awhile back. I found the L-zone on my Emax loose. Repositioned it, tightened the rings and resighted. all was apparently well, until i went to turn the speed ring. It wouldn't budge. Thought I had over tightened the rings. what actually happened was I had gotten the speed ring onto the mount and pinched it to same. Easy fix once my brain was working again, lol.