[Nurnburger]

Your frame perimeter is supposed to be the part that hits the wall first were you to hit a wall without bumpers on. Therefore, I don't think it would be legal to attach anything onto the underside of the bumpers. I don't know the rule number, but there's one that says you can extend past the frame perimeter to the bumper perimeter for two seconds every two seconds. So if you wanted to attach anything that controls the ball that way, it would have to be attached to the frame and then actuate outward.