The main spring is the one that pushes the hammer. The other spring is called the valve spring.
air flow. hammer hits valve releases air that goes up tube through bolt and pushes ball.
the air screws shouldn't impact much unless there is a blockage or a leak at them.....so I doubt it.
what square screws are you talking about? I thought you were talking about the valve retaining nut. are you talking about the air screws on the outside? those are suppose to be allen screws....they could be stripped.