If you only replace the broken spring your old spring will be weaker as it will have lost some of its pull.
Old style garage door side springs.
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If you have one spring on each side of your door one of your springs breaks the spring on the other side will probably break soon.
Side mounted springs are long heavy springs mounted on each side of the upper garage door track.
This tension makes it easier to lift the garage door from its closed position.
If it was opening too quickly move it to the next lower hole.
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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.
As a result you may run into balance issues if you only replace one spring.
Retest the door balance as you did in step 1.