The Schlage B502-191 cam does not work with the Modular Cylinder design (released around 2011.)
The B502-191 should be replaced with either:
(This article written in 2016. The Von Duprin catalog is slated to be corrected by removing references to the B502-191.)
Can you have the Von Duprin literature reviewed and updated
to reflect the cam change? The B502-191 should be replaced with either
the L583-474 (1 1/8” cylinder) or L583-475 (1 ¼” cylinder). See attached.
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