There is a threaded eye bolt that can be adjusted to get enough slack to attach the chain.
How to attach a garage door arm to the chain.
This is where the opener arm attaches the opener to the door.
Grasp the chain 1 foot from where it connects to the end of the threaded chain anchor.
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.
Press down on the chain with your finger.
Attach the bracket that connects the arm the door is opened by one arm that raises it as the carriage travels along the tube.
Swivel the arm down and allow it to.
Pull the chain toward the garage door and hold it in position.
You should have 1 2 inch of play in the chain.
Pull out the cotter bolt with the pliers.