if you have a dremel or similar type tool you could drill cross slots and put a phillips head of sorts in there(actualy screw driver with vice grips for leverage, phillips head inside of a socket. be creative)

If you do end up doing that make sure to drill somewhat deep slots so you dont strip that out too.

Guess i should add that should be a sort of last resort option. cause if those strip out too you gonna end up having to drill the thing out.