Firstly for a whitco mk ii tasman lock the lock needs to be in the locked position.
How to remove whitco security door lock without key.
To do this when door is open you will need to press the deadlatching pin which sits above the main latch next you will need to undo the cylinder retaining screw.
Some locks designed for interior use may have these holes on the exterior side for homeowners who have lost the key.
Slip a straightened safety pin into small holes or use a flat screwdriver to press against a slot or depression.
This trick will allow you to remove the cylinder from the lock even if you dont have the.
This is a video on how to remove the euro cylinder lock from a door.
Learn how to replace or change the security door lock under three minutes.