I was shooting a 1994 .45 Vaquero this afternoon and was having problems with the cylinder not lining up with the barrel. The pin hit the edges of two primers without setting them off (I was lucky) and the base of several other cartridges. I can make the empty cylinder over rotate by cocking it quickly with my left thumb. I bought the revolver used earlier this year and know nothing of its history. It does fine when cocked slowly. Has anyone else had this happen to them? Any suggestions are welcome.