Arcadia's housing stock centers on 1965, a good six years past the median for the wider service area we cover out of Pasadena. That gap matters because it's roughly when a lot of tract builders shifted from extension-spring setups mounted along the horizontal tracks to torsion springs mounted on a shaft above the door. In Arcadia we see both, sometimes on the same street, which means the first ten minutes of any call is just figuring out which system you've got before we touch anything.
For torsion jobs, that's unwinding and replacing the wound spring on the shaft, checking the center bearing plate, and setting the drum cable tension back to spec. For extension setups, it's swapping the stretched or snapped spring above the track, checking the pulley and safety cable, and making sure the door doesn't slam if the cable fails again. Either way we're not guessing at spring size off a chart - we measure wire gauge, coil diameter, and length on your actual door, because two houses built the same year can have different door weights and different springs.
We don't do temporary patch jobs on a spring that's already stretched or corroded. If it's failed once, it gets replaced, not re-hooked.