Across the broader service area, the housing stock runs newer - median build year sits around 2001, with most of the stock dating from the 2000s. Sun City West doesn't match that. Its homes were mostly built around 1990, which is over a decade older than the norm elsewhere in the territory. That gap matters because torsion springs, cable, and rollers all have a service life measured in cycles, not years, and a decade of extra cycles on top of already-old hardware is what pushes a marginal spring into a snapped one.
Layer on the climate. This is a severe-heat region, and heat is hard on lubricant and metal fatigue alike - grease breaks down faster, and springs that flex all day in a hot garage lose tension sooner than the same part would in a milder climate. A 1990-built door in this heat band has usually already seen one or two spring replacements by the time we get the call, which means the hardware underneath may not match what came stock on the door.
That combination - older stock, harder climate - is the reason a fix that works fine on a newer door in another part of the territory doesn't always translate directly here.