Should be easy to drill out. However, don't discount the left hand drills. I once had a starter mounting bolt snap off flush in a boat motor in a really awkard place. I could get to it to drill it using a mirror laying in the bilge, but there wasn't enough to get a swing to drive in and EZout. I ordered a short left hand drill bit, used the EZout hole as a pilot and started the bit. It came out with no effort. This of course is an entirely different size range. but te concept is very under rated I think. My theory was that the heat generated by the bit may have in some way may have been a contributor.
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