Purchase new garage door extension springs.
How to install garage door extension springs.
The new spring s diameter length and wire size or gauge must be the same as your old spring.
Replacing garage door extension springs is not a difficult task provided you know all the key steps.
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.
Do not try to remove the extension spring that is not broken when the garage door is closed.