With an appropriately sized lathe and mill, you could make a replacement swivel base easily. With a drill press, hack saws, files and such, you could still make one, not quite so easily.Man those look better than when they were new. You do excellent work.
I have a 4” craftsman from the early 50’s that was left outside for years and rusted pretty badly, but it was free. I cleaned it up and use it almost everyday.. the swivel was broken so I bolted it to a 1” piece of oak which clamps to my workbench. I could use another one but they are hard to find and when you do find them They are expensive.
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Building my own desktop machine (mostly) shop here. Got a few more things to build or buy myself...
It is a nice job, btw. I've got a little 3"? Craftsman vise on a cobbled together metal workbench that has been sitting outside for some months that will be coming back in today after I cleared space for it in another room in the house. I have the former garage, and former back porch for my workshop/office/clothes closet, reloading bench, and toybox.