Open-bearing steel rollers were fine in 1982 because nobody expected forty years of freeze-thaw cycling on them. Cold-climate freeze-thaw cycles are hard on the open-bearing steel rollers that shipped on doors built around 1982 in Villa Hills, and what we actually find on the stem is rust scale built up inside the bearing race, not just a worn wheel. That rust doesn't stay put - it transfers onto the track surface and pits it, which is the part homeowners don't see coming. A roller that looks fine from the driveway can be dragging a groove into galvanized track that's already thin from four decades of salt and moisture. The other way this goes sideways is the spring. A door that's been fighting rusted rollers for a year or two puts extra strain on the torsion spring every single cycle, and sometimes the roller call turns into a spring call once we're actually looking at the hardware. We'll flag that before doing any extra work, not after the invoice.