Roll up doors with tracks and.
Old style garage door side springs.
If you only replace the broken spring your old spring will be weaker as it will have lost some of its pull.
Many conventional doors with hinges at each side use one piece springs at each hinge.
Garage door springs come in three basic types and each is measured differently.
As a result you may run into balance issues if you only replace one spring.
If the door was closing too quickly move the spring to the next higher hole on the bracket.
Adjust the springs on both sides of the door the same way.
Once the spring is free of tension remove from its track hanger.
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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.