pro mac 800

Hi, about 18 months ago someone gave me a Pro Mac 800 because it stopped working. I finally got around to investigating and it's nipped up so I'm in need of at least a new piston, but possibly also a cylinder too (haven't investigated too closely). I'm wondering where to get parts. I've...

Hi All, Recently picked up a pro mac 800 saw that unfortunately is missing a decomp valve. Looking for knowledge of any other saws valves that might work or if could plug with bolt and still run? What size is thread for bolt replacement.