- 1). Close the garage door with the remote control or wall switch. Place a ladder inside the garage to access the top of the door.
- 2). Measure the inside diameter of a torsion spring with a measuring tape. This is the distance across the opening in the center of the spring, not including the spring coil.
- 3). Stretch the measuring tape 20 inches along the torsion spring's length. Count the number of coils in the 20-inch distance. Divide 20 by the number of coils to determine the wire diameter of the spring. For example, if there are 80 coils in 20 inches of spring, the wire diameter is 0.250.
- 4). Stretch a measuring tape along the entire length of the torsion spring. Record this length. Do not include the length of winding or anchor cones for mounting. Measure both sections of a broken torsion spring and add the two measurements together for a total length.
- 5). Record information about the outside end of the torsion spring and its direction. The excess half-coil points clockwise or counterclockwise. The clockwise spring is a left-wound spring; counterclockwise is a right wound spring.
- 6). Purchase a new garage-door torsion spring according to the wire-diameter calculation, length, inside diameter and winding direction of your existing spring.
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