Mortise – A recess cut into the surface or edge of the door or doorjamb, usually for the purpose of housing hardware like hinges or lock parts. Strike Plate – A metal part with a hole or ...

Make sure the latch and the striking plate are lined up right. If the door knob isn't working, it could be due to the latch or the strike plate. Make sure the latch is lined up right and tweak the ...