Originally Posted by
lineinthewater
The only way I can make sense of it is that he stuck an allen key in the threaded portion of the star nut, in a (poor) attempt to use it as a lever to pull out the star nut.
What a mess that would be
If true, then I'd say that the OP's only shot is finding the right size drill bit, drilling out and re-tapping...
Or, more sensibly, taking it to a shop.