corbin russwin control key for zero bitted lock

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Answer
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 lever may be missing the slot feature for the core locking lug.  Verify slot is in place.