Post #289475 by Paipo on Sat, Mar 3, 2007 5:40 PM

On 2007-03-01 20:06, pdrake wrote:
thanks, dav. the diamond drill bits are flat on the tip. that's the problem.

That is a problem - flynny's technique will work with those but I use these shapes for all my hole making needs:

The ball shapes are best as you can curve the hole if you need to. I tend to only use the round-end needles if I'm going deeper or just roughing out a hollow space.