Re: Ignition barrel removal!!
Those bolt heads were once egg timer shaped, when they install them at the factory or when you get new ones the top breaks off and your left with just the bottom half.
This is of course so no one can loosen them and disconnet the steering lock when stealing your car.
Take a centerpunch (not to sharp) pick a spot at the side of the head and make a mark straight on, once a deep mark is established then tilt the punch and tap it in a counter clockwise position, this has always worked for me, good luck.