Castration Rings for Locksmiths! Bump Keys! Mr. Locksmith Video
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Bump Keys: My Grandfather was a locksmith and he called it “Rapping a Cylinder” today we call it “Bumping a Lock” with “Bump Keys.”
When bumping a lock, the key is initially inserted into the keyway the “Castration Rings” helps to keep the Bump Key one notch (pin) short of full insertion.
Bumping the key inward forces it deeper into the keyway. The bump key transmits a slight impact force to all of the key pins in the lock. The key pins transmit this force to the driver pins; the key pins stay in place.
The pin movements are highly elastic, the driver pins “jump” from the key pins for a nanosecond, moving higher than the cylinder (shear line of the tumbler), then are pushed normally back by the spring to sit against the key pins once again. Even though this separation only lasts only a nanosecond with a light rotational force or tension is continuously applied to the key during the slight impact, the cylinder will turn during the short separation time at the shear of the pins, and the lock can be opened while the driver pins are elevated above the shear line.
Lock bumping takes only an instant to open the lock. The lock is not visibly damaged, although the force of the bump can leave an indentation on the front of the cylinder.
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Terry Whin-Yates is a 3rd Generation Locksmith with a BA (Hons) Criminology. He has 35 years experience in the locksmith and security industry and is a locksmith trainer providing locksmith training to people and businesses all across North America. Terry Whin-Yates‘ BC Security License is B4227.