Been needing one for ages, but kept putting it off. The design that I drew didn't pan out when it came to reality - there's a lesson in there somewhere!
The base measures just over 2" wide and just over .5" thick. I'm not sure where I got it, but it's got to be foreign and in the metric system. It's not tool steel, but I still might use some of the leftovers in a guillotine tool.
The bolt shanks are 1" diameter Grade 8, and I welded a mild steel button to the top. I also radiused the front of the bolts so I could taper and spread without putting sharp impressions in the metal. This also gives me the added benefit of being able to do a dimpled edge treatment on flat stock.
The upright portion gave me fits. I wanted something with plenty of holes so I could use it for different jaws. I'll be using the threaded portion of the bolt to make texturing jaws, hopefully it will give me a bark-ish/vine-ish look, and I will be making a butcher/veining arm with a bit of leaf spring. I have a moveable fence designed in my mind and will be making some top arms that allow me to run grooves and such down the length of a piece. Then I need to make a "universal" arm that can hold a selection of punches Also might design a flatter or set hammer type of jaw. Basically, there's a lot of tooling that can be designed to help a one-man shop needing a third hand!
Just needs a bit of tidying up and a stem welded on.