How To Change Mortise Lock Set
Mortise lock set are standard of a bygone era. Today’s cartridge cylinder knobs are more versatile and safe, not to mention easier to install. When modernizing a lock from a plug-in to a modern bud, you must fill the void left by the locking mechanism before boring for the new lock. The best way is to fill the space with a wooden block, designed to fit tightly. And then proceed as if you are working with a new flat door. You will also have more space to fill around the edges. Auto putty cures better than traditional wood filler and will not shrink.
Locate and remove the screws in the plates on both sides of the door. There are typically four, one near each corner. Remove the screw under the edge of the inside lever to disengage from the spindle and pull the two knobs from the door. Then, remove the two screws that lock the door from the door edge. Gently pry the lock from its hole with a small flat screwdriver. Remove the two screws that secure the striker plate to the jamb and remove the strike plate.
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Measure groove or mortise, the edge of the door, from front to back and top to bottom. Measure the depth of the mortise by inserting the tape into the door until it hits the back of the mortise. Mortise lock set vary greatly in size. The dimensions of the hole will be slightly larger than the lock you removed.