Well got the "first draft" done today. I didn't spend a lot of time on this, just "welded right through" the zinc, LOL. I've grown to HATE zinc. Adjuster is common "redi bolt" "all-thread" whatever you know it as. I used "plenty" in case I want to telescope the arm in a hole or two. Used two connector nuts, one for a crank to fit, and the other to move the "carriage." Piece of 1/2" tube welded at right angle allows for movement