Most of what we see on 1985-built doors here is a straight swap: torsion spring for torsion spring, matched to the door weight and drum size that was standard for that era, not whatever's cheapest on a shelf. If the opener's original, the drive gear has usually worn past the point of a quick fix, and replacing the unit outright costs less over time than chasing intermittent failures. Cable and roller work is quick once we're on-site, usually the same visit. The one thing that stretches a job past a single afternoon is a part that isn't stocked - some of the older track hardware from this build era isn't something every supplier carries, and if that's what's needed, we tell you up front instead of promising a same-day fix we can't back up. That's the honest limit: we carry what covers most of what fails on houses this age, not every obsolete bracket ever made.