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In locksmithing, a broach serves a very specific and crucial role. Its primary function is to cut the keyway into the cylinder plug. This process involves removing material from the cylinder to create a precise pathway that ensures the corresponding key can properly align with the pin tumblers of the lock. A keyway must be accurately shaped in order for the lock to function effectively, allowing for smooth insertion and turning of the key.

The construction and design of a broach allow it to create these intricate cuts, often featuring multiple cutting edges that can produce the desired profile in a single pass. This is essential for maintaining the security and integrity of the locking mechanism, as a poorly cut keyway can lead to malfunction or compromise the lock’s effectiveness.

Other options refer to different aspects of locksmithing that don't align with the primary function of a broach. For instance, a method of key duplication involves other tools and processes, while a type of lock component or a device for locking mechanisms do not specifically relate to the precise cutting action performed by a broach.