1958 side-mounted spring setup difference
That gap matters for cost, because a door original to a 1958 build is more likely to carry a side-mounted torsion or an extension spring setup instead of the center-mounted torsion hardware that got standard on newer builds. Parts for the older configuration cost more to source and take longer to get, which shows up in the invoice. We price the job after we see what's on the wall, not before.
