In terms of the functionality of how the cylinder works please review our video, and specifically at minute mark 4:15 as seen here:
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In essence the first chamber is cut as a lockout type of cut on the captive thumb-turn and only the use of the removal tool would allow you to extract the captive thumb-turn.
Part number for the uncut blank is 4165-XX-5001. Fill in the XX with the thumbturn finish.
Release key part number is 4165-82-2001
Please reach out to our sales department to place you order for these items.
Please describe your application to its fullest and I will consult the factory