Place a wedge at the bottom of the door to keep it in place.
How to fit a internal door lock.
If the knob is to the right select a right handed door.
Remove the two screws from the latch plate on the edge of the door and remove the latch from the opening.
If the doorknob is on the left you need a left handed door.
Create a mortise and holes for your lock and door handle.
If you re installing a pre hung door make sure you get the correct swing determined by the placement of the hinges and doorknob.
This allows you to pull the door knobs off the door from both sides.
This process will vary somewhat based on the doorknob you are installing.
Create a mortise for the plate around the latch on your door using the technique described above.
Turn the key so the locking bolt protrudes from the lock and hold the door against the door frame.
Tape measure pencil flat drill bit for wo.
Fit the wedge into the bottom of the door as close to the wall as possible.
Begin by removing the screws from the door knob on the interior side of your door.
First mark out the place where the strike plate has to be fitted.
Hold the door latch against the face of the door flush with the door edge and mark the spindle centre on your previously marked centre line see fig 1.
Open the door and stand with your back to the hinges.
Using a square mark this centre line for approximately 4 100mm on the face of the door the pencil mark can be removed later with an eraser or damp cloth.
Shake the door a bit to make sure it is secure.
In some cases door latch plate mortises might need to be cut or enlarged.
Tools needed for this job.
Purchase a door stop or professional grade door wedge from a local hardware store or from an online retailer.