The tray power unit uses two speed 600 rpm motors to roll the balls towards the flywheel

Both of the rollers are connected to each other to save motors

There is only one motor being used allowing the other motor to be used for other components and saving space.

The rubber bands are braided to ,match the curvature of the ball allowing for the most contact  on the ball by the rubber bands.

Thicker axles are also used to prevent the axles from bending overtime. 

Standoffs are also added between the gears to prevent the gear from bending due to the force of rubber bands puling it in.