Garage Door Chain Hoist - Wall Mount Shop By Number_Hinge No.2 including both left and right

including both left and right drums

You can control up to two separate devices with it as it's mounted to your visor or attached to your key chain

Left and right included (one pair)

The only way to get the proper extension spring is by door weight

Garage Door Chain Hoist - Wall Mount Shop By Number_Hinge No.2 including both left and rightGarage Door Chain Hoist Wall Mounted Units (4: 1 models): Install Sprocket onto door shaft with key and set screws. Install the main unit to the wall so that the roller chain will be free of slack when installation is complete (shorten roller chain if needed). If not already completed during the previous step, install the roller chain between the main unit and sprocket on the door shaft (move the sprocket on the door shaft if necessary to ensure the