I have a Bridgeport Power 8 drawbar on an Interact Series 1 Mk1, with air problems. I have the exploded view of the impact mechanism from Kurt, however there is a set of solenoids involved with the brake and speed control motor, and also a funny little air line widget with three ports involved. Anyone know where to find an exploded view, theory of operation, or can just explain to me how it is supposed to work?