Doors sized for two-car garages, which are the norm in the newer construction around Stallings, usually run on two torsion springs rather than one. When a homeowner replaces just the broken side, the mismatched spring tension puts uneven strain on the other coil, and it's common for the second spring to go within months. We replace both as a set on double doors for that reason. Cold, damp winters in this part of the state also work on spring coating over time - moderate cold cycling causes coils to rust at the wind points faster than a strictly dry climate would, which is one more reason a spring on a 20-plus-year-old door is worth replacing rather than patching.