If a Schlage ND lock is ordered with the B cylinder suffix (which refers to Less Small Format Interchangeable Core/SFIC), then the lock will come supplied with a core spacer (part number D500-000) as well as the tailpiece N523-091.
The D500-000 spacer should be used if a 6 pin SFIC core is installed, but the spacer is not needed if a 7 pin SFIC core is installed.
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