[Paul West]

My team does something quite similar. Our arm uses the same two-window drum at the back, but the arm telescopes 3 feet and the end hook doesn't rotate. It hits all three levels and uses a pot to get to the the correct hight for each peg. The arm is made of a professional steel slider with the telescope powered by a banebots and belt drive. The telescoping piece is 1/8" thick x1" wide angle.