Schlage Full Size Interchangeable Cores (FSIC) are supplied 1-bitted when 0-bitted is requested.
Although it is mechanically possible to use all #0 bottom pin in a FSIC core, Schlage will not supply cores pinned this way. Though most customers will choose to re-pin a 0-bitted core, many customers opt to use these as is, and this creates a problem: 0-bitted FSIC cores can be installed, but they cannot be removed. The control key for a 0-bitted core simply slides out because the teeth on the key have nothing to grab. 1-bitting the cores ensures that even if these are not rekeyed, they can be both installed and removed right out of the box.
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