Use this tool to put your pulley or gear mechanism into motion! Also useful for quickly winding rubber motors on Kidders airplanes and boats. This labour saving tool winds 5 revolutions on the motor for every 1 hand crank turn. It has a 2mm spindle so be sure to buy our bushings (Cat# 80-3588-00) that convert the 4mm hole of your pulley or gear to a 2mm. Gear and motor sold separately.