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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.
Do this to both springs if you have two springs. The shaft will be free to turn and you can replace the cables and reset and secure your cable drums. To reset your spring tension follow the necessary steps for reinstalling the garage door cables and winding the springs.