Hi... I thought I would show the group a modification I made for my rotary attachment. The holders that come with it leave a lot to be desired. I found a couple of Maximat type chucks on ebay, and machined an adapter for them. The jaws are reversible, which allows a fairly wide variety of objects to be held concentrically, from a toothpick to a soda pop can. They can also hold simple jigs such as hollow centers and pointed centers. The chucks are 2" in diameter.
Oh, and my machine is a ULS machine.
Mark