4x6 bandsaw vice modification and dead stop

[Toolmaker51]

in re: Jaw Jack Screws. Most home and small shop machinists curry all kinds of similar traits, none perhaps more common than economical use of material. That'll include knocking up parts out of material bits big shop toss out with abandon. A phrase depicts this, a personal favorite stemming from someone here (could be M. Klotz or PJ), "It's not scrap until it cannot be clamped". Shortened parts save labor, and touchy operations such as parting in the lathe too. It also works carving multiple parts from one strip, sawing into pieces, leaving just a little profile to mill, sand or just deburr.
Holding the off side of jaws would be used in all those instances.

One regular occasion is in pump work. sawing a short bit for a bushing or slip ring from a fat stub of centrifugal-cast bronze. I don't want to machine a 1/16"th more than needed. The material is expensive, laborious to clean up chips which go everywhere, or any avoidable issues. A new saw's been added where I'm a guest, it needs a jack too. Your post reminded me of the most desirable feature, quick release nut they'll love. They saw a wide variety of size and diameter, thinking I'll put 2 or 3 openings in the spring nut, so pressure could be closer to whatever height of material being clamped. This will (should) reduce deflection, where jaw loses some perpendicularity (and secure clamping) to saw bed.