Disengage the broken extension spring one end at a time.
How to change a garage door extension spring.
Detach the cable and thread it around the pulley to free the spring.
Once in place disconnect the.
The new spring s diameter length and wire size or gauge must be the same as your old spring.
If both springs are old you should replace them both at the same time.
Place scale under the garage door on the side of the door with the broken extension spring.
You may need to use a 2x4 or some other object to pry the garage door open.
Purchase new garage door extension springs.
Do not use a digital scale as they often will not respond to the door weight changing as rollers no longer stick to the track.
The easiest way to do this is to take the broken spring to a local garage door dealer or home improvement center so they can help you find an exact match.
Open the garage door to remove all spring tension and clamp it in place.