The horizontal feature of my Rockwell 21-122 is awesome... except for the hassle of setting it up. The vertical head and motor are heavy, a pain to remove and re-install, and irritating to re-tram.

Having collected the ball in both hands, stand sideways to the target. The throwing arm is taken back behind the head. Pull the non-throwing arm through. Throwing arm swings forward keeping the elbow ...

Only 6 months late. Milling and then boring out the larger hole, realizing I'm terrible at measuring, attempting to correct issues and making everything worse. Fun!