Many conventional doors with hinges at each side use one piece springs at each hinge.
Old style garage door side springs.
Roll up doors with tracks and.
If it was opening too quickly move it to the next lower hole.
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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.
If you only replace the broken spring your old spring will be weaker as it will have lost some of its pull.
Retest the door balance as you did in step 1.
Garage door springs come in three basic types and each is measured differently.
Once the spring is free of tension remove from its track hanger.