West Puente Valley's houses cluster tighter around 1956 than the wider Pasadena service area, which runs from 1943 up through 2012 with a median of 1959. That three-year gap sounds small, but it puts most of this neighborhood's garages a notch earlier in the postwar building run - right when builders were still using lighter steel sections and simpler torsion setups before manufacturers standardized the heavier track hardware that showed up a few years later. With 5,201 households packed into a compact area, a lot of these garages were built in the same short window by the same handful of tract builders, so you see the same door, the same spring size, and the same failure points repeated street after street. If your neighbor's spring went last spring, yours is likely wound the same way and due around the same time.