On 22 Feb 2006 03:54:11 -0800, "Eric Anderson"
wrote:

I have talked to a company here in Michigan that sells mag drills
(after you guys suggested it), but so far the chuck in the one I found
takes a minimum drill size of 7/16, I believe. I was sort of surprised
at this, but that was my 1st attempt.

Can you find (or make) a threaded insert to compensate for the
difference between 7/16 and the #1 drill you wanted to use?