Along with the stuff I got with my lathe was a 2 way milling vice similar to the one in the first pic but not so well made. It was marked up as Jacob and has "made in taiwan" on the bottom so they are hoping people will mistake it for a Jacobs product and expect quality no doubt.
Anyway when I was handed it I wondered what the heck I was gonna do with it and it sat on the bench while I did others things.
So I want to turn it into useful vertical slide for the lathe.
Started off by stripping it down and getting rid of the bits for the top slide (actually if I had thought it through a bit longer I would have left a bit more on it but never mind can't unturn it).
I was going to make it to bolt onto a right angle block I was also given but then had a better idea for a permanent solution, we scrap loads of bearing housings at work and I sometimes rescue them from the scrap bin with the intention of using them for ?something?
So I grabbed the biggest one I had stored in my area at work and saw the two ends off to leave enough meat to tap into and put the two together on the four jaw to turn it square. Turned out great according the the right angle block

The plan is to attach this to a plate with various holes to match the mounting holes for the slide which you can see in pic2 with the bearing housing part.
I did intend to mount the vice from the 2 way slide but then thought about the top slide from my old Drummond roundbed which I think will be a much more useful option.