Hi, I have just purchased a 6inch Southworth Duplex Pump that runs, but its a bit stiff on one side. So I plan to take it apart, find what's causing the stiffness and then reassemble. In the meantime I have undone the water chest and made sure all the balls for the pump are free. I have oiled the steam chest and all the links. I have had a look on line and have found some videos, but not too much else about assembly and setting up the timing. There was no paperwork with the pump so if you have any information or advice on setting the pump up, its timing and assembly would be very much appreciated, thank you