Broken Key Extraction

Photo identification and something that connects you to the lock. For a house or apartment that is a lease, a bill, addressed post, or confirmation from the property manager; for a business, your role there; for a vehicle, the registration or ownership papers with matching identification. If the documents are inside, say so on the phone and the check is completed once the door is open.

Extractor tools grip the key, not the lock, and are meant to leave the pins, springs and plug as they were: hooks and spirals ride in the keyway grooves beside the fragment and draw it out the way the key travels. It is not certain, though; a deeply lodged fragment or a prior failure can still leave a lock, especially a vehicle cylinder, needing further work. Damage most often comes from what happens before the locksmith arrives, mainly tweezers, screwdrivers and glue, which is why leaving the keyway alone matters.

Whatever the lock's own maker specifies, since cylinders differ: many call for a dry graphite or PTFE spray blown into the keyway and worked in with the key, once or twice a year, while others prohibit graphite and specify their own product instead. General-purpose oils, grease and sprays feel smooth at first but on most cylinders collect dust and clog the pins, which leads back to the sticking that breaks keys. A little goes a long way; too much of any lubricant can also hold moisture.