For my headlights (clear corner mod), I used a Cotter-pin extractor on one of them, and it worked like a charm...no drilling. I did have to drill on the second one though, and it was no big deal. So I tried both methods, and they both work, but I do have to say the cotter-pin extractor is MUCH easier if you can get away with doing both.

Failure is simply the opportunity to begin again, this time more intelligently.