So I've got a 1930 Enfield revolver in .38 S&W. I've put a hundred rounds through it and accuracy is quite good. The timing is fine and the lock up has just a tiny bit of wiggle. I've have 12 instances of the hammer striking too lightly to fire. The firing pin protrusion is within spec. Do you think this is a main spring issue? Any ballpark ideas on how much it will cost to fix? It's a $250 gun so I don't want to spend much. Any input appreciated.