Hex key broken off in ARP stud...
another idea is to find a small punch and try to dislodge the broken piece.
either way, place some rags around the stud, this way if a piece comes off and you don't see it, it will be caught with the rag.
Otherwise, you have to use a pick, punch, or drill it out. Depending on how 'stuck' it is.
Anymore input is welcome. 


