A pair of new springs cost about 25.
How to instal a garage door spring.
Disconnect the garage door opener so the door remains closed.
This can still be done when only one extension spring is broken.
Use locking pliers or a c clamp to secure the door to the track to keep it from opening when you release the tension on the springs.
You may need to use a 2x4 or some other object to pry the garage door open.
Unplug the garage door opener and clamp the door to the track.
Weigh your garage door.
Some garage door openers have a neutral position for the trolley disconnect.
Garage door springs come in two styles.
There are two types of garage door springs.
The doors with two springs are easy to replace.
A couple of carabiners can.
On older openers you may need to remove the l shaped drawbar arm.