Dear Sir:

      I need O-rings for the disc, but I can not pull out the shaft. It appears that the top cap consists of 2 pieces. The bottom piece is cast together with the cylinder body. But my top piece is stuck with the bottom pice so that I cannot pull out the shaft and the piston. Is there a good way to separate the 2 top cap pieces? Do we just pearate them by force? Please advise. Thank you very much. Sam.