control key will not remove core from best lock

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Answer
The lever may be missing the slot feature for the core locking lug.  Verify slot is in place.
A control key is required to install or remove an interchangeable core from a housing or lever. The control key is identified by having "CONTROL" stamped on the bow. How to install and remove an i...
Conventional Cylinders - A conventional cylinder is one that requires some breakdown of the lock in order to be removed. These are the most commonly used cylinders sometimes called key-in-lever...
Choose the appropriate full size control key from the selection below.
Classic Conventional Key Blanks and Cut Keys Part Number Description Key Blanks 35-056 Control Standard bow, embossed both sides 35-076 Standard bow, unembossed both s...
A lock specified by a cylinder suffix BDC will be supplied with a disposable small format construction core, see Figure 1 below.  There is no metal key but instead the BDC cylinder has a ...
A small format disposable core is used as a SFIC construction core that is for low security applications and can be thrown in the waste bin after use.
A zero bitted Falcon SFIC core is combinated for the control key to be cut at all 4's.
For all Schlage and Falcon small format interchangeable cores shipped from the factory 0-bitted, the control key will be cut to all 4's.
The JD YA6 tailpiece is intentionally designed such that the tailpiece cannot be installed at the same time as the cylinder.  Interchangeable cylinders assume that the lever and taipiece is in...
See the JD Yale Lever installation instruction HERE
After rotating  the key to unlock the lock, you must return the key to its normal position to remove it.