Extension springs are more forgiving to look at than torsion springs - no drum, no cable drawn tight around a shaft - but they're still under real load, and the safety cables that should run through them are the first thing to fail quietly on a fifty-plus-year-old door. If a cable's missing or the spring's rusted through, that's not a tighten-a-bolt job. Adjusting spring tension, swapping a broken extension spring, or replacing hinges on an original wood door is where we'd tell most Rose Hill owners to call rather than climb the ladder. Lubricating hinges and rollers, tightening loose track brackets you can reach from the floor, and testing the auto-reverse by placing a 2x4 under the door are fine to do yourself and won't void anything.