I drilled a 1/16” by about a 1/4” deep hole in mine for pins. I make my own washers though. I used a 5/32” bit that I rounded to the shape I wanted and first drilled that until the full width of the bit just met the surface of the vise anvil face, then drilled a 1/16” hole to center my forming die that has a short piece of 1/16” drill shank stuffed in the end.

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Those are the holes the other set up is for polishing washers. Don’t have a pic of my forming punch, I’ll have to post that later for you.