The power drawbar is all air , uses the original valve off the back of a $10 3/8 impact wrench used to turn the drwbar . there are a couple of air cylinders that drive the unit down on the drawbar . I would be happy to share the drawings for this one but I sell the unit in Kit form for a reasonable price. If you studdy the pics its not hard to duplicate.
That's what I thought it looked like but what a very nice professional job you did.
When I decide to make one, you'll be hearing from me -
