0zchan1120 10 years ago ReplyUpvoteOn my first ball machine, on Youtube on the account zchan1120, a attached the motor to one of the gears sticking out to make the chain taught. the lift was not that tall, but the chain did not sway at all. However, I am now working on a ball machine where one of the main lifts is over 7 1/2 feet tall. I currently have the motor attached to the bottom, but the chain sways a lot. Beware that if you have too much trouble with the chain lift, there are other alternatives. i used an air pump from the Big Air Ball Machine in my first custom made ball machine, and Shadowman 39, on Catacylism update 1 on Youtube, uses a modified motr from the rippin rocket rollercoaster kit to "shoot" the ball straight up.