Side mounted springs are long heavy springs mounted on each side of the upper garage door track.
How to install a garage door side spring.
Unplug the garage door opener and clamp the door to the track.
The doors with two springs are easy to replace.
Disconnect the garage door opener so the door remains closed.
The springs extend along the shaft and work by twisting as the garage door closes by means of cables attached to each side of the lowest garage door panel.
A pair of new springs cost about 25.
There are two types of garage door springs.