For a broken torsion spring, we match the spring to your door's weight and cycle life rather than grabbing whatever's closest - an undersized spring just fails again in a year or two, and on an older single-spring setup we'll talk to you about adding a second for safety, since that's now standard practice even where it wasn't originally installed. For cable or roller wear, we replace in pairs, not one at a time, because a fresh cable paired with a stretched one just shifts the load unevenly. If the track is bent from someone forcing a stuck door, we'll tell you straight whether it can be reset or needs replacing - sometimes it's a cheaper fix than people expect, sometimes it isn't worth chasing on a door that's near the end of its life anyway. One limit worth naming: if the opener itself is the failure and the model is old enough that parts aren't sourced anymore, we'll say so rather than stringing along a repair that won't hold.