OK, got the 3-1/2 nut out.
Next is a Wilton 5 inch machinist vise that I'm trying to fix. I got one of the nut pins out pretty easily using SkyPuncher's video tips. But the other one is broken off. The nut itself slid right out, but now I'm trying to get the pin out and man alive is it ever stuck. With the nut out I can stick a 3/16ths drill bit through one pin hole, and line it up with the pin, but all efforts at driving the pin out have failed. Any tips for this one? And where can I get new pins?