From a spare key. Use your file to clean up the key so that all the grooves and peaks are at matching heights.
This is the method that i most suggest.
How to use a bump key.
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When it comes to actually making a bump key you have two main options.
Insert the key into the lock.
How to make a bump key crafting the key use a metal triangular or taper file to grind the grooves into the bump key.
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Here i show you exactly how bumping a lock works with a real lock milled out so you can see the internals as they are bumped open.
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You can choose to either make the key from a blank or you can choose to make the bump key from a spare key.
A 999 or bump key can be any key that fits a particular pin tumbler lock and that has been modified so that all of its cuts or grooves are made to the deepest allowable position as defined by each manufacturer.
It should be noted however that the use of bump keys is not undetectable as originally thought and the use of bump keys can lead to permanent damage to a lock depending on the lock the force applied and the frequency of lock bumping attempts.
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File all the steep peaks down so they are only 4 5mm above the grooves.
In a typical pin and tumbler lock there are two sets of pins known as the driver pins and the key pins.
Push it in until it stops then pull back slightly until you hear or feel the last pin.
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Keys of roughly the same size will often fit any lock with the same mechanism like a cylindrical lock.
Bump keys exploit a vulnerability in pin and tumbler locks related to the pin stacks which are the spring loaded stacks of pins that keep the cylinder of the lock from being turned without the use of a proper key.
How to make a bump key.
The option that you decide to go with really depends on what tools you have available to you.
Fit the key into the lock.
The term fit means that the key will enter the keyway the front of the lock but will not unlock it.
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