I have been eyeballing a 4" screwless vice for my Atlas MFC. Mostly because it can be laid on it's side and clamped down, so it presents the work more like a conventional vertical mill. Right now I use a regular mill vice, without the swivel base installed, and it's tedious at best. Mostly I've found that I use my clamping kit and blocks to clamp directly to the table. I really wish I could make a tooling plate for it, but the thickest metal I have on hand is only 3/8" plate.