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Locating The Bore On The Frame To Accept The Extended Spring Latch
To locate the hole on the frame to accept the extended spring latch, with door open, use a tube of lipstick to paste down the latch extending from the door edge. Retract the latch with the door handle and keeping it retracted, close the door into the frame so it is firmly against the frame stop. Release the handle so that the latch strikes the door frame. You may need to retract and release the latch several times to result in an acceptable mark on the door frame. Once you have done so, retract the latch and open the door. You have just created a marking point to drill the frame by. Eye up the center of the marking. Using a 1" spaded bit, press against the frame with the tip and move the bit by hand to ensure that you will only drill into the frame avoiding the door trim. Drill the hole deep enough to accept the extended latch.

Use the manufacturer supplied strike plate as your template. From the side of the frame that the door closes into, line up the lip on the strike plate opening to the side of the drilled hole that is closest to you. Check that the strike plate is level. Using a pencil, draw a line around the strike plate. With hammer and chisel, mortise the wood out to allow the strike plate to sit flush into the frame surface. Locate the center of each screw hole in the strike plate and mark with a sharp pencil. Remove the strike plate and drill the two strike plate fastening points employing the appropriate drill bit according to the diameter of the screws supplied by the lock manufacturer. Drive the fastening screws through the strike plate and firmly fasten down. Close the door. The latch should drop into the strike plate hole.

TIP: In the event of misalignment of the strike plate, where the latch cannot properly extend into the strike plate hole, cut the heads off of 2 Golf Tees and drive them into the strike fasten point holes with a hammer. You can now proceed to relocate and drill the strike plate fastening points.

Required Installation Tools
  1. Pencil
  2. Drill
  3. Drill Bits
  4. Deep Hole Saw (2-1/8" in diameter) and Mandrill
  5. 1" Spaded Bit
  6. 1" Chisel
  7. Hammer
  8. Phillips Type Screw Driver
  9. Square
  10. Awl
  11. Installation Template (usually supplied with a new lock)
  12. Wood wedges


"Proper Door And Frame Preparation to Install A Key-In-Knob Lock" article written by A Perfect Pick Locksmiths® and is Copyright © 2007-2013. No portion of this article may be reproduced in whole
or in part without the express written consent of the author.

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