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...ate is screwed to the door, the lock case slides over it and is secured in position by two or more grub screws which are concealed whenever the door is closed. ...iture comprises of lever handles, the handles then return to their correct position.

; [[Partial position progression|Partial Position Progression]] ; [[Rotating constant progression_System|Rotating Constant Progression System]]

* Determine the levels of keying and total number of key systems needed. ...sion should minimize the number of incidental master keys. Ideally, proper progression leaves no duplicate key bittings or key interchange. Random key bittings mu