Fish the ball behind the center support at the bypass opening, wedge the head about 6" into the pipe and go to work. Only issue was the door edge marred the surface of the rods a little, not enough to be concerned about though. I used a cordless 18v drill, no issues. I did cut the whips to 5" from the ball beacause as I suspected, the ball did ride the walls of the pipe on the 45's. Seemed to work fine.