Guys I am researching how to make a power drawbar for a BP mill,looking for suggestions on how to make one from scratch.Not looking for a kit 500 plus is beyond my financial means so wanting to make one.I have watch few Youtubes and they date back to 2014 so I'm sure progress has been made far as parts goes.So was wondering if anyone has made one and where you got the parts such as butterfly impack,air cylinder and I see that special fitting are needed to bleed off air and have check valve in there also.This is where google did not help me at all with locating those valves with check valve and adjustable bleeder.If possible please shead some light on this project,need all help I can get.