Most of the towns we cover from Skokie sit on a median build year around 1963. Berwyn is older - the housing here centers on 1938, a full generation earlier. That gap matters more than it sounds like it should, because garage doors built in that era used narrower tracks and steel rollers with open bearings, not the sealed 11-ball nylon rollers you'd find on a door installed in the 1960s or later.
Open-bearing steel rollers depend on grease staying put in the bearing race. On a door that old, decades of temperature swings and prior lubrication jobs - some good, some not - leave that grease inconsistent from roller to roller. One or two rollers seize slightly while the rest still spin free, and the door starts pulling to one side as it travels. That's a roller problem wearing a track problem's clothes, and it's the single most common misdiagnosis we run into on Berwyn's older housing stock.
We drive out from Skokie for these calls - 14 miles - so when we're on site, we're checking roller wear against the actual age of the door, not guessing from a chart built for newer construction.