[steelsmith101]

I would do as Rhuat posted and drill and tap the pin and then use a jack screw or a slid hammer to pull the pin, all you need to move it will be about 1/8" or less and it should come right out.
Or you could use a pair of vise grips if you can lock on to the top if the pin, remove the adjment screw and replace it with a pice of all thread rod with a slidehammer setup.
As it should be a taper pin it only needs to be moved a little to get it free,.
Nice looking vise it will be a great pice to have and work with for years to come.
Joe