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Key factors in cylinder length Door thickness Mortise lock position in door leaf Faceplate thickness door handle Faceplace thickness of inside door handle Cylinder length calculation formula Tltal length=door thickness + faceplate thickness of outside door and inside door handle Outside length=faceplate thickness of outside door handle + dinension of mortise lock outside center position Iutside length=faceplate thickness of outside door handle + dinension of mortise lock inside center positi