I got the same machine Coats 705 and love mine. Thought about rebuilding the air cylinder but was afraid of ruining the spiral lock ring that holds the ends on. Also on mine I got brass ******* from the auto parts store that threaded right into the cylinder on the top and bottom and put them on the foot pedal also, then used standard 3/8 air hose with hose clamps to hold the hose on barbed fitting ,instead of replacing the rotten original hoses.. Use rawhide leather Ken tool aluminum wheel protector and you won't mar wheels at all Ken tool part no 31810. I also made an extension piece on my lathe to make the outer piece raise up higher for todays wider rims. Put a Ludwig speed king bass drum pedal on the foot control also