Hi, I have a Russian capture byf 42 that I've cleaned and re-assembled. For some reason I can't figure out, it won't go back to either of the 'safe' positions after I put it into the fire position. It won't fire at all, either. This is my first Mauser. I've dis and re assembled the bolt may times thinking maybe I screwed up, but no luck. Can anybody tell me what the problem might be? Thanks.