Watching this series of videos you will find the answer . http://www.youtube.com/watch?v=Yd6JyUQe3tY&feature=bf_next&list=PL0B7B3E47F65E1164
You have to take out the key and open the holes a bit and carefully with a proper screw.
You have to take out the key and open the holes a bit and carefully with a proper screw.