I purchased mine at Camp Perry 10 odd years ago and lost the darn regulator pin, I just found the bloody thing tucked down in the foam in the case, however I can't get the thing to fire after loading one of the gas tubes with CO2 I suspect I had turned some of the screws way back when trying to fix the thing before I figured out I had lost the pin... what to do? No one seems to know how to work on these puppies and I don't have a clue how to readjust the thing to fire! It's a 500 dollar paper weight at this point! Can anyone assist?