I had posted about this device a while back. I originally had a foot pedal on it but wasn’t happy with it. I changed it to lever operated and after a few months I’m very happy. Reach down a little pull up adjust the vise reach down push about an inch or so tighten the vise. I made it all with hand tools so anyone could make one. Some flat bar a few screws a piece of all thread hacksaw, drill, and a tap. A readily available and inexpensive vise screw was the only purchase. I do have machine tools available and could fabricate a fancier one but not everyone has that option. It works on the simple idea of a half nut.
Jim