I revised the horizontal vise for my Makita slider and made the profile lower, made the assembly easier and added the the thumb lever type release as shown in Don Taylor's photos.
Old one works okay, but this one is nicer and easier to make. Hard maple and Birch ply.
I also increased the screw rod holding the half nut to #6 because harder to find #4 in that length.
Seems like this could be adapted for bench dog holes...