This Champion Pneumatic Machinery Air Compressor, Model X-4, was purchased NEW by my Grandfather back in the 1930's. It runs great! I am now refurbishing it. I have called the manufacturer, who put me in contact with a local representative. He was helpful, in that he was able to find a two page factory parts number sheet. This was ALL the Champion Pneumatic Machinery Corp has in their archives. No parts available! They were able to tell me that this model was manufactured between 1930 and 1932, as a "Portable". I have disassembled and found that there was no corrosion or broken parts. There is only three gaskets, which I have made, on the pump. All parts are original, except the flywheel.