On Mon, 30 Jan 2012 00:14:33 +0000 (UTC),
(Larry W) wrote:

What kind of bit did you use? Have you tried a self-feeding type like
one of these?

http://www.swaintools.com/store/pc/v...?idCategory=43

That's exactly what I used. I got 1/2 inch deep in 10 minutes.