Howdy. New to smithing. I am trying to replace my mainspring housing on a Para GI expert and install a Wilson fitted beavertail using the Wilson jig. 1. In reassembling with the new ms housing, I cannot get it into place without the hammer being locked in the forward position. If I try to cock the hammer, it won't go. What did I do wrong? 2. To use the beavertail jig, I need to remove the safety, but the dang thing will NOT pop off. What the heck? Thanks in advance.