I removed the lock from the stock of my T/C Cherokee to clean it, first time since I acquired the gun, and stopped. The lock is different than pictures of the other locks I've seen pictures of. The problem I seen right off is there is a cover over the main components of the lock and one of the screw heads is broken. Do any members have a setup like this and does anyone know if this screw is just to keep the cover in place of is it holding the parts in place? It's the top middle screw in the picture.