
Why Keys Break — and Why a Mortise Lock Complicates Things
Keys break for a handful of well-understood reasons: metal fatigue from years of daily use, a worn or sticky cylinder that requires too much force to turn, a key that was poorly duplicated from a copy-of-a-copy until the blank became thinner than the original, or a moment of frustration during a lockout when someone applies torque at the wrong angle. Colorado winters add another layer — metal contracts in cold temperatures, locks freeze up along the Front Range, and the extra force needed to turn a key on a January morning in Denver is sometimes exactly enough to snap an already-weakened blank.
Mortise locks present a unique challenge during extraction because the cylinder sits inside a pocket machined into the door stave rather than sitting in a simple bored hole. This deeper, more confined geometry means that standard extraction techniques used on a cylindrical door knob lock do not always reach the fragment cleanly. Our technicians are experienced with the internal mechanics of mortise lock assemblies — including the cam, the tailpiece, and the lock body itself — which allows them to approach the broken fragment from the correct angle, minimize rotation of the plug during removal, and protect the internal pins and springs that would otherwise be damaged by an untrained attempt.

