Hi all, ive got a Benjamin .20 co2 pistol with a problem.Everytime I load a co2 bulb in the gun and screw down the plug , the gun lets all of the pressure from the bulb go before I can even get a single pellet loaded. Ive taken it to bits but cannot see anything wrong with it. I gave up with it about 7 months ago, but I really would like to start using it again. Any ideas ? Thanks