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Posted by Jay for Jerome Andrews, CML - Photos (5) on August 28, 1999 at 17:08:40:
In Reply to: BEST Removable Cores|
There are two approaches to drilling Best or any small format interchangeable core (SFIC). One, drilling to save the core for the bitting information, and two, drilling for core extraction only.
The pictures that follow are from my ALOA ICore class. They illustrate drilling to save the core for decoding. If one has a lot of cores to remove, drilling one core in this fashion and decoding for the control key (13 - top pin = control bitting in a properly combinated A2 system core) may be practical. It also has the advantage of saving the other cores for later use.
I like to use a large bit, i.e. 1/4" to 3/8", and drill very gingerly right between the E and S until I've broken through the face and into the boss onto which the face was pressed. Once the face is pried away the core can be shimmed, the plug turned to the right and the core withdrawn.
To simply drill the core out, I'd use a 1/4" bit and drill slightly lower, cutting right through the control shearline. Then tap a large screwdriver into the plug and turn hard to the right. It is often necessary to drill several times to clear out top pin fragments that block the rotation."