Get an E-Z out (it's a tool used to remove bolts when the head has snapped off or rounded) and the proper size drill bit. Should be available at the local hardware store. Be very careful not to do damage to related components, or yourself for that matter, as you work. Best wishes,
T\E
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2003 Iceman Challenge - 2:34:55 - 897 / 2,000*
2002 Iceman Challenge - 2:39:23 - 1093 / 2,186
2000 Iceman Challenge - 2:49:18 - 1516 / 2,153
*estimated