Quote Originally Posted by muffett.2008 View Post
Why don't you ask the bloke that told you on the other forum?

(one of my pet hates, people that post the same thing on several forums)
Missing part is locking knob w/ 4-48 left hand thread. That is why virtually ever one i've see is missing.
natural tightening (RH) spins the knob out of the sight. Must be a few buried at ranges throughout Canadaicon.
OGC