There should be a series of screws that connect that portion of the lock to your door.
How to remove security door lock.
Once you remove the screws the lock should become loose and you can pull both sides of the lock out of the door.
One way screw is a special screw that common use for secure doors or windows.
Removing a cylinder door lock.
Cylinder locks are extremely common but how to remove the cylinder is not quite as obvious as a knob door lock.
When you remove the faceplate it will reveal the inside of your knobset lock.
It does not have the option to screw out.
This is a video on how to remove the euro cylinder lock from a door.
Once this is removed a locksmith can re key this for you.
Once it goes in that is it.
Remove the screws in the knob with a screwdriver.
Grasp the interior trim in one hand and the exterior trim.
This trick will allow you to remove the cylinder from the lock even if you dont have the.
Remove this screw using a drill or screwdriver.
Security gate cylinder removal.
Step 2 look for a small set screw at the base of the handle.