Remove cylinder fixing screw from the door. The screw can be located on door edge, in line with the bottom of the cylinder.
Whilst slowly turning the key, apply pressure to opposite end of cylinder. As you do this, the cam will begin to line up with the lock mechanism, and can be pulled out. The key usually needs to be turned approximately 25 degrees clockwise, or anti-clockwise.
Fitting replacement euro cylinder
Insert key into cylinder and turn until revolving cam lines up with cylinder body.
Guide cylinder through the door, and ensure that the end labelled ‘EXT’ faces outside.
Push fixing screw through hole on door edge, and screw to secure the cylinder. Be careful not to over tighten.