Originally Posted by FBinNY

I don't want to be the one that recommends drilling your CF frame, but since the builders do it, it must be OK within reason. Riv-nuts are the way to go. Make a template or gauge and check the hole position 3 times to be 100%+ sure before drilling because you don't want to do this twice.

After drilling, seal the sides of the hole with nail polish. I also put a dab of body filler around both the inside and outside riv-nut flanges to accommodate the tube curvature and make a bed for the nut.

If you have an open BB, remove it so drill chips don't make a problem. If it's a cartridge, you can leave it an and shake out any chips next time you remove it for service.