02-22-2012, 07:38 AM
The one I have is a Black Diamond #2B from the 1960's that I found on the local Craigslist. It's nice, but has some limitations. It only accepts up to 1/2" drills in the set of bushings that came with the machine, and a 9/16" in the master collet. It does do a very repeatable, high-quality grind though.