If its the same setup as the w123 it was quite a pain, I hired someone to do it, they spent 2-3 hours trying to figure it out when I came back I saw that they were manhandling the car and getting nowhere. I asked them to stop, had the car towed to my house and did the job from there myself. There is some kind of pin in the piece by the steering column that you can press when the key is put into acc. As the key couldn't be turned at all on my car all I did was drill out that pin. Now like I said this was in a w123, I hope this helps