Most garage doors in Nitro went up around 1958, a decade before the median for the wider service area of 1967. That matters for spring repair because doors from that build year are almost always single-car, steel or wood-panel doors on lighter torsion or extension hardware than what's sold today. The truck carries standard torsion springs sized for the 7x9 and 8x7 doors that dominate this kind of stock, plus the drums and cables that go with them. What we don't carry on the truck is anything custom-wound for an oversized door, because Nitro's housing mix, mostly single-family homes from the 1949-1993 building wave, doesn't call for it. If a door here turns out to need a spring outside that standard range, that's a special order, and we'll say so up front instead of jury-rigging something that won't hold.