I've got an H&R topper 48 that won't fire. The hammer falls when you pull the trigger but stops and won't push the firing pin much. I'm guessing it's a weak hammer spring probably or has someone experienced this and was it something else? I can push the hammer when it's down as far as it'll go and it'll push the firing pin and then bounce back if I let go of it. Maybe the spring has gotten too short or compressed and isn't pushing it far enough. Anyone know what type of spring this takes (and where to get it) and a parts diagram/schematic before I try to disassemble it and replace it? I've come across a couple different type of springs made for different H&R single shots.