The complication on a torsion-cable door is that the cable is never the only thing under load - the spring on that shaft is holding real tension, and a cable that's already partly frayed can let go the moment we release the wrong clamp. On a house built around 2002, we're also checking whether the original drums have any wear grooves deep enough to keep chewing through a fresh cable within a year, which happens more than people expect on original 20-year-old hardware. Because this area's income and household numbers put a fair number of these garages in daily two-car use, we also see uneven wear side to side - one drum wrapped clean, the other showing rust and flat spots - which means we're often replacing both cables even when only one has failed, so the job doesn't repeat itself in six months. We don't stock every obscure drum size on the truck, so if the door uses a less common shaft diameter we may need a short parts delay rather than finish same-visit.