To attach a rim lock: (1) Place the lock against the side of the door and mark thru the key hole and knob spindle hole with a sharp awl or divider point. (2) Remove the lock and bore appropriate sized holes. (3) Fasten the lock and place the escutcheons, knob spindle and knobs. (4) Locate and attach the strike or latch plate.
Fig. 139. Gain Ready for Hinge
To place a mortise lock, [Fig. 141]: (1) In a manner similar to that used in placing the rim lock, locate the knob spindle and key holes. A more accurate result is obtained if the knob spindle hole is located by four points, one at each corner of the square, [Fig. 142.] In placing the lock, keep the selvage back from the edge of the door a scant 1/16" so that the selvage may be sunk below the edge of the door by that amount when mortised in.
Fig. 140. Rim Lock
Fig. 141. Mortise Lock
This will permit the door to be trimmed without the removal of the lock in case the door should swell after being fitted and locked. (2) Bore the holes for knob spindle and key. (3) Locate a center line on the edge of the stile and bore for the mortise which shall receive the box of the lock. (4) Place the box and then mark about the protruding selvage using a sharp knife, [Fig. 143.] (5) Remove the lock and "gain in" the selvage, [Fig. 144.] (6) Fasten the lock by means of the screws thru the selvage and attach the escutcheons, knob spindle and knobs. (7) Close the door and mark the vertical position of the latch upon the jamb. (8) Open the door and place the latch or strike plate, locating its vertical position by means of the knife marks just made upon the jamb, and its horizontal position by a measurement taken from the latch to the face of the door; transfer to the jamb by rule or gage. (9) Scribe about the plate and then gain it into the jamb. On a door with a rabbeted jamb instead of an adjustable stop, the essential measurement will be from the back arris of the stile to the front of the latch. (10) Attach the plate, then chisel out the openings for latch and bolt.
Equally common is the practice of taking step (3) first, with steps (1) and (2) taken after step (5).