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Can a Primus cylinder be installed into an older A-series lock that has a 5-pin keyed knob?

A-series locks manufactured prior to 1984 had the option for both 5-pin cylinders and 6-pin cylinders. To be able to use a 6-pin cylinder (including Primus) in a lock that was prepped for 5-pin cylinders, the 01-018 Knob and Sleeve (for 6-pin) would have to be ordered to replace the existing 01-015 Knob and  Sleeve (for 5-pin).



The same would apply to the Schlage H-series keyed knob.


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