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Extension springs are coiled springs installed on both sides of the door above the door's horizontal track.
Torsion springs include a shaft, spring and a drum assembly, normally installed directly above the door opening. The torsion spring distributes the weight of the door more evenly, particularly with a very wide and extremely heavy door. A standard torsion spring should be installed and removed by a garage door professional only. This is a very dangerous job due to the amount of tension on the springs.
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