Instead of drilling out a bolt that has broken off flush with or below the surface, try this:

  1. Find a round punch slightly smaller than the bolt (or make one by grinding down a chisel).
  2. Use a hammer and the punch to make a screwdriver-like slot on the top (broken end) of the bolt.
  3. Try using a screwdriver to remove the broken bolt.

From: http://www.tradetricks.org/archives/2005_12.html

 
removing_a_broken_bolt.txt · Last modified: 2010/06/16 13:42 (external edit)
 
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