For a town like Elmhurst, where older extension-spring hardware is common, we carry stock in both spring types rather than assuming everyone's on torsion. That means multiple extension-spring gauges, replacement pulleys and safety cables, plus the torsion springs and drums needed for the houses that have already been converted. Given the region's cold-moderate winters, we also stock weatherstripping and bottom seals sized for older single-panel and early-sectional door frames, since those don't always match the seals sold for newer doors. One limit worth naming: if a door's track or jamb is bent enough to need welding or custom fabrication, that's a job we'll refer out rather than force a fix that won't hold.