Let me suggest using a drill press if possible to do the center-drilling. You only get one chance to get it right, and dealing with an off-center hole just adds to the frustration factor. Use a straight-flute EZ-out for the best chance at getting it to move without expanding the broken-off piece in the hole. Good luck!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!