I would say you did well. The vise has the spring and the whole mounting plate, so it truly is complete. Turn freely? You know that is on the big side for post vises too. But what is that length of chain there for, sort of limiting the jaw opening? Now you have to make a shoe, for the foot of the post to sit in. Piece of steel plate, with a hole for the post to drop down into, and in good contact with the floor, so it would not tear up your bench. Old, it sure is, but with a name, my guess is from 1885-1920. BTW, what is your bench top made of? Can't identify it. Tractor seats are comfy, way more than a round padded stool. You certainly got a lot for the money.