Place the key in the lock and gently pull it towards you as you turn it to the left (10 o’clock) or right (2 o’clock) positions to align the cam. When the cam is aligned, the lock should slide out towards you.

With the door open, turn the key so the bolt is in the locked position and remove the key. Then remove the screws holding the faceplate in position.

Remove the internal door handle and the spindle bar connecting the two handles. Retain this for refitting later.

If the new lock body or faceplate is larger than the old, use a hammer and wood chisel to enlarge the mortice (hole) so the new lock fits properly in place.

Once the lock body is in place, screw the faceplate into position. Then, replace the spindle bar and handle. Check that the new key turns smoothly in the lock.

Remove the existing strike plate from the door frame, then hold the new one in position to test its fit. If need be, mark where adjustments need to be made to the recess, before using a hammer and wood chisel to remove the excess wood.

If the overall length of your replacement lock is longer than the old one, use a hacksaw to shorten the tail bar so the two locks are the same length.

Screw the lock body back into position and use the new key to test that it works properly before closing the door.

Select a wood drill bit of the size recommended in the bolt manufacturer’s instructions. Mark the depth of the bolt on the bit with masking tape.

Drill a pair of horizontal holes, to the marked depth, into the centre point of the edge of the door. The holes should be near the top and bottom of the door.

Slide the bolts into position and use a pencil to mark the outline of the end plates onto the edge of the door.

Use a hammer and chisel to remove wood from within the pencil marks so the end plates can sit flush with the door.

Next, hold the bolts against the inside of the door, flush with the edge and use a carpenter’s awl to mark the position of the keyholes.

Using a wood drill bit of the recommended size, drill the keyholes – these should be on the inside of the door only and not right through the door.

Place the bolts into position, then put the keys through the new keyholes to check they line up and turn smoothly.

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Use a small wood drill bit to drill pilot holes, then screw the end plates and keyhole plates into position. Double check that the key and bolt still turn smoothly.

Follow the bolt manufacturer’s instructions, and a similar process to that above, to drill and fit the strike plates. Most bolts have a small bump on the end that, when the door is shut and the key is turned, can mark the bolt’s position onto the frame to ensure accuracy.

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