Mark II of our knife vice is much stronger and easier to adjust, thanks to some nice knurls with M10 threads. Simple to make - a strong piece of angle iron, a scrap of 10mm flat bar, 200mm of rectangular section, an M10 nut (or what ever suits your bolt), a washer, some scrap 3mm MDF and two M10 bolts with a knurled end. Drill a 10mm hole in the back of the angle iron and in the front of the rectangular section. Drill an 8.5mm hole in the scrap of 10mm and tap an M10 thread, weld the nut onto the rectangular section and then the 10mm piece on the back. Clean up, paint and assemble.
Unscrew the back to move, and do up to lock. Simple.
More photos below