I can't get these sons of bitches open. I screw it to the left and right and cannot remove the piece. I don't want to damage them. I just bought a weatherby and these came with it, also with NO instruction of how to install them. Sorry if this is seems like a novice question but I have never dealt with this kind of sling swivel.

Anyway can anyone explain in detail how to open and attach these to my studs?