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What key cuts are controlled by the Primus Number?
In a master keyed Primus cylinder, different reference numbers drive various elements of the key and cylinder.
The Structure Number (plus key symbol) drives the top cuts on key and the tumbler pins (upper set of pins) in the cylinder. See drawing below in BLUE.
The Primus Number drives the side cuts on the key and the finger pins (lower set of pins) in the cylinder. See drawing below in ORANGE.
If both numbers (Structure Number and Primus Number) do not match what was previously done, then there will be operating failures when trying to use old keys with new cylinders or new keys with old cylinders.
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