Ron showed us his excellent hobo nickel vise so I thought I'd share mine which was made by Jack Graves. Jack's a tool & die maker and when I saw this vise I was blown away. Tightening the allen screw on the bottom draws the precision collet in and tightens it securely around the nickel. The collet has a slot and a guide pin in the side of the holder prevents the collet from spinning as it's tightened. It's massive, heavy, and made with toolroom precision.