I screwed up and when I was reassembling my Mark III , I was watching YouTube at the same time. After putting the bolt in I flipped the hammer up instead of making sure the hammer strut was in the right spot. I got the gun back together, but the gun won,t fire. When I tried to disassemble it the mainspring housing only comes out about half an inch and then stops. Does anyone have any ideas on what I need to do so I can disassemble it.