Elgin's houses carry a median build year of 1971, which puts this area at the early edge of the broader service area's 1971-1995 range, closer to the 1960s-70s stock that shows up across several of the named communities we cover. That six or seven year gap against the area median of 1978 matters more than it sounds. Doors and openers installed in the early '70s are a full product generation behind what went into houses built even a decade later - heavier steel sections, simpler extension or early torsion spring setups, and hardware that was never designed to be rebuilt piecemeal. By the time a torsion spring from a 1971 install fails, it's usually not alone; the drum, the cable, and sometimes the track bracket have fatigued on the same timeline. We don't assume a newer-era fix will bolt onto an older-era door, because often it won't without an adapter or a full hardware swap.