The screw I am referring to is located on the bottom side of the front bracket of the scope mount. It is quite small, about the size of a grub screw, and it appears to seat just about flush with the underside of the mount. The tip of the screw is pointed and I assume it is intended to be some sort of locking screw to assure the scope does not rotate within the mount. I have looked through the Zf-41 manual and find no mention of it so I assume it is something only an armorer would have engaged or adjusted. I am curious whether this screw has damaged any scopes because it certainly looks to be able to punch a hole through the tube if over tightened.