I was kidding about the red loc-tite, I use tLoc-tite products everyday at work! I was also thinking I could use clear nail polish, it would work the same. I just don't know if the tensile strength would be good enough to handle that kind of recoil! another question is could I not just use a "cross bolt" style end block for the scope stop, something like a SHCS (Socket Head Cap Screw) with a nut on the end? it would give plenty of tightening strength!