No spring rewind or cable reuse
We don't wind an old spring back up or reuse a cable that's already frayed - if one cable failed under load, the other one is on the same clock. If the call is a door off its track, we check whether the track itself bent (common when something hits it) or whether a roller sheared, which happens more often on the original hardware still running in houses from the earlier decades of that 1958-2005 range.