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Torsion springs are normally mounted horizontally above the opening of your garage door. When you pull the door down, cables attached to the bottom corners actually force the springs to wind up, in turn energizing the system.
Torsion springs are the most common type of springs used on garage doors. It is critical to have the correct size springs in order to maintain a properly balanced garage door. When ordering replacement springs make sure to use the How to Measure section of this page. This will ensure you get the correct springs.