Follow our Moxon vise plan and build your own portable Moxon twin-screw vise. The portable Moxon vise is designed to hold work above the standard height of a workbench. The Moxon vise design is widely attributed to Joseph Moxon (1627 – 1691). Moxon’s 17th century book The Art of Joinery first described the double-screw vise.