The service area sits in a severe-heat climate band, and that pressure lands hardest on hardware that's already older. Grease that would last two seasons in a mild climate dries out in one summer here, and a torsion spring that's been cycling since 1978 is already near the end of its rated life before the heat starts working on the galvanizing. What we get called for most in Yucaipa is broken torsion springs on double doors, opener gear kits stripped from working harder than they were built for, and cables fraying at the drum from years of unlubricated running. One honest limit: some original 1970s hardware - certain spring sizes and a handful of discontinued opener models - isn't stocked by anyone anymore, ours included. When that's the case, replacing the unit costs less in the long run than hunting for a part that may not exist.