So I've just been recovered off the M3, in my unhappy Targa 4, with the accessory drive belt not being attached to the things it needs to be attached to. The belt looks in good nick, so I'm guessing something metal has broken somewhere I can't see, as I do recall hearing a small clunk earlier about 5 mins earlier, when the steering got stiff. Are there any common bit that end to go, or is this a likely one off?