The truck stocks the sizes that cover most of what we see in houses from this build era: standard torsion springs, galvanized lift cable, steel and nylon rollers, and the common bottom brackets. For a straightforward spring or cable repair on a 1968-era door, we usually have what's needed without a second trip. Where we run into a wait is a less common spring wind, an odd-width track, or a door panel that's been discontinued - those sometimes have to be ordered, and we'll tell you that at diagnosis rather than after we've started the job. We also carry weatherstripping and bottom seal in the common widths, since cold-climate houses lose a lot of heat through a gapped or cracked seal. We're honest that if the fix is really a worn-out door rather than a worn-out part - rot in a wood panel, a steel door rusted through at the bottom - we'll say replacement beats repair instead of patching something that'll be back on our schedule in a year.