Most houses in South San Francisco went up around 1963, and a lot of that original garage hardware is still bolted to the jamb. Torsion springs, center bearings, even the lift cable on some of these doors have never been swapped once. That's not a guess about the neighborhood - it's what you'd expect from a housing stock built in that narrow window, before anyone was replacing springs on a schedule instead of waiting for them to snap.
The mild temperate climate here hasn't been the enemy. No deep freeze, no road salt eating the tracks, so a lot of this gear has lasted far longer than it would somewhere with real winters. But steel fatigues on a cycle count, not a calendar, and a 60-year-old torsion spring doesn't care that the weather's been kind to it. When it goes, it usually goes all at once, mid-lift, with the door half up and the cable slack on one side.
We see the same pattern across the older sections of the service area - original hardware carrying decades of cycles past what it was built for - but South San Francisco's 1963 median puts it right in that bracket where original springs and rollers are the rule, not the exception.