W204 metallic Klack when inserting key

[steve-V8s]

When I put the key in the hole normally there is a modest clunk type sound, which I assume is the steering lock operating. Occasionally however it has been making an altogether louder metallic klack instead.

Anybody know which bit is about to break ?

[buggalugs]

Google W204 ESL!

[steve-V8s]

Yep looks like that is it.

Thanks.