Across the wider Joplin service area the housing stock runs from 1971 to 2004 with a median around 1984, but Carthage sits older than that average at a median year built of 1973. That decade-plus gap matters for garage doors specifically: steel torsion springs and bearing hardware from the early-to-mid 70s used different wind counts and shaft diameters than what's stocked on trucks today, so a straight swap-in part doesn't always fit without an adapter or a resized shaft. With roughly 5,456 households in this area, we're not dealing with a handful of outliers - this older hardware is the normal case here, not the exception. Winters in this region fall in a cold, moderate climate band, and steel hardware that's been through forty-plus seasons of temperature swing is more likely to have hairline fatigue in the spring coils than a door installed in the last fifteen years, even if it looks fine sitting still in the garage.