Two things collide on an older Elmhurst house: the age of the opening and the climate band it sits in. The service area runs in a cold-moderate climate zone, which means steel doors and their hardware go through real seasonal expansion and contraction every year. On a door and track combination that's been in place since the 1960s, that cycling has usually already worked the fasteners loose and glazed the rollers, even before you touch anything. Add a heavier replacement door bolted onto that same worn track, and the mismatch shows up fast - within a season, not years. At 12 miles out, Elmhurst is closer to South Barrington and Inverness than it is to the Schaumburg shop, which is why we schedule installs here in blocks rather than one-off same-day runs, and why getting the hardware right the first time matters more than it would on a job we could easily swing back to fix next week.