While rummaging through a machine shop that was selling out. I noticed that the shop's owner was real carefull to remove a chuck from the one drill press before someone thought that it went with the drill press. I asked him what it was and he called it a Walhstrom chuck. He demonstrated it to me and I was amazed (I am easily amazed though). You change bits while the drill or mill is running by pulling down on the collet. The bit falls right out! I figured it wasn't for sale, so I did what any red blooded American cheapskate would do.....I searched Ebay for one. I found one new in the box with several arbors, including an R-8, for about $50.00 shipped. This will be great when drilling receivers and switing from a spotting drill to various other size drills.