2. Drill holes Instructions For Installation of Single and Double Cylinder B 0 A Determines backs st or 23/3"} A Check lock for proper backstabbers | of the lock marking. B. Drill a hole through B. Fold attempts over door edge. both skies of the door ac shown. . Mark cents for 2 hole. . Drill a hols into front face D. Merak center for 17(26mm) diameter of the door. tats hole In road acreage. Be certain holes are perpendicular. 3. Install Dead Bolt Adjustable deadbolt is factory preset 2 backseat.