Two stacked together will allow you to dial down past zero till you feel pressure. Then back up to your zero. You won't get a dead stop on your zero. I feel it tighten up 1/4 turn past zero on mine.
Somebody oughta could should make some in various thicknesses. I'm gonna have to experiment a bit. Machinist/benchrester up the road drills and taps the cover-cap-knob and puts in a longish set screw with lock nut so as to adjust it and lock it.