Crestline sits eleven miles from Mansfield, which means the crew loads a full roller kit before the truck ever leaves - there's no local depot to run back to if a part's missing. That drive shapes how the job gets scheduled; it usually gets grouped with other calls in the area rather than squeezed in as a same-hour add-on. Most houses in Crestline went up around 1956, right in the middle of the pre-1960 wave that makes up most of the housing stock across the sixteen towns this company covers. Doors from that era usually still ride on steel rollers set into narrower track than what gets sold today, and in a cold-band climate like this one, steel rollers stiffen and crack faster than the nylon rollers found on newer installs. That combination - old track, old rollers, real winters - is what actually drives most of the roller calls out here, not wear from daily use alone. It's worth saying plainly: this isn't a Mansfield problem showing up in Crestline. It's a Crestline problem, tied to when these houses were built and what was available then.