The buildings and the hardware
The buildings in Trainer are a mix of older houses and small multiunit buildings; that mix affects the hardware you see. Older wood doors often have mortise or rim locks that require different parts and a bit of on-site fitting, while newer entry doors use bored locks and cylindrical deadbolts that are quicker to swap. Apartment buildings may have keyed-alike systems or master-keyed cores, which means rekeying needs careful pinning and record-keeping. Storefronts and commercial entries tend to use heavier-duty cylinders and panic hardware, so we carry parts and know how to match commercial-grade components to existing doors.