Does anyone know if there's a reason why you wouldn't want the moving jaw to pivot to keep it relatively parallel to the fixed jaw when you're clamping? I'm certain the fixed arrangement is stronger and maybe, pinching the work with just the top of the jaw works like putting a rod/wire between the work and the moving jaw on a mill vise. Also, did he dip his drill in borax powder when he was drilling one of the medium sized holes? Whatever he was using, I haven't seen that before.