Press down on the chain with your finger.
How to attach a garage door arm to the chain.
Attach the bracket that connects the arm to the door then attach the arm itself.
Attach the bracket that connects the arm the door is opened by one arm that raises it as the carriage travels along the tube.
This is where the opener arm attaches the opener to the door.
You should have 1 2 inch of play in the chain.
Grasp the chain 1 foot from where it connects to the end of the threaded chain anchor.
The exact location varies depending on the door.
On the chain there is a device called the trolley.
Pull the chain toward the garage door and hold it in position.
Thread the nut s facing the door clockwise until it meets the bracket then release the chain.
Using pliers remove the cotter pin from the cotter bolt that attaches the upper end of the door arm to the carriage.