I drilled mine out with no problems. Make sure you have a sharp bit, a 1/2" drill's got more power, get a helper to shoot a little WD40 or oil as you drill. But then once you drill those holes out, you can never go back to the smaller stock bolt setup.

2005 Model . Two Fast Eddy stickers , a bell and a clock . She's Lola . She tinkles and keeps time . http://s649.photobucket.com/albums/uu211/britbike05/