Horton Hunter I have Horton Hunter 175. The screw right above safety lock which holds optic is loosening itself for every couple of shots. It results in inaccurate shots. I have to tighten the screw every 5 shots. This screw is not secured with nut on the other side of the body. It broke down maybe. Can you advise what should I do? Glue it or get nut? It is difficult to get nut for the bolt thread like this here.