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Bump keying refers specifically to a method of opening a lock using a specially cut key, known as a bump key, which is designed to apply force to the lock pins. This technique involves inserting the bump key into the lock and then striking it with a tool, which causes the pins inside the lock to jump momentarily, allowing the lock to turn and open.

This method exploits a vulnerability found in many pin tumbler locks, where the alignment of the pins can be manipulated. The bumps created on the specially cut key match the shear line of the pins within the lock, which is why it can be effective even against locks that aren’t necessarily worn out or faulty. Proper understanding of bump keying is essential for locksmiths, both for securing customer properties and for recognizing and counteracting security risks.

The other choices pertain to different aspects of locksmithing but do not specifically define bump keying. They relate to key duplication, lock design features, and security installations, which are all distinct practices within the field of locksmithing.