samfishers wrote:RAAAAAAAAAAAAAAAAAAHHHHHHHHHHHHH *********.
what kind of specific key? where do you place it?
Have a search here, focuissing on the keyword "SFIC" (stands for small format interchangable core).
The 'specific key' key which removes the core is placed in the same place as you place the operating key (ie they keyway). It is commonly referred to as the control key. The control key looks just like an operating key, but is cut to a different bitting.
These locks have two shear-lines.
One is called the operating shear-line, and it functions just like the shear line in a normal pin-tumbler lock and simply allows you to open and close the lock.
The other shear-line is achieved by having extra pins in each chamber, and a sleeve around the plug. When the correct control key is inserted, it will align the pins such that a shear line is created which allows the sleeve to turn, which in moves a lug which is retaining the core.
There are special tension wrenches which allow you to place tension on the sleeve itself, thus allowing you to pick the control shear line. Otherwise, picking these locks can be a hit-and-miss affair - when you set a pin, you can't really tell if you have set it to the operating or the control shear line. Unless all pins are set to the operating shear line, or all to the control shear line, the lock won't budge.
There's plenty more information and probably clearer explanations of this if you just search for "BEST" and "SFIC"
Hope that helps,
...Mark
Top Secret eh?
