I have never taken a gearbox apart. I tried contacting some gun doctors on this site but have gotten no response. I decided to take things into my own hands.
I had some things break so I am trying to fix it. This is as far down as I could get it. I am trying to get at the spring, piston, plunger etc, but can't figure out how to get the copper sleeve out. All screws are out, the only thing left is the fire selector pin that goes through the gearbox (I think) I can't push it through for the life of me. Even with a hammer and a punch.
So my question is How do I get at the piston and all that fun stuff from here?