So I started looking at the vise that was been on my dad's workbench for longer than I've known him. The good news is it's a Wilton. The bad news is that it's mounted too far back on the benchtop and I think the screw hole in the the sliding jaw is not aligned properly. It's approximately a 4" vise IIRC, the handle is long gone from the swivel lock and the swivel bolt just bounces around in the base. Yeah, it's got issues.
So I pulled it off the bench and I found the head of the swivel lock bolt had been bent/worn which I attempted to reverse without any perceptible success with a hammer. The swivel bolt was loose so I pulled it, cleaned it, antiseized it and reinstalled it. Minimal improvement.
So why do I think the screw hole in the sliding jaw is out of kilter? The first ~2" opening goes real easy, then the rest of the way you don't have to crank on it, but it takes some effort. When I pulled the screw I could see the outside of the sliding jaw was worn above the hole, but not below. Then when reassembling it I had to close the jaws most of the way in order to get the screw to enter the nut, otherwise it just wanted to go between the nut and the sliding jaw beam. I've found lock nut assemblies online for a reasonable price but I don't know about the swivel nut. Will I have to order a new base to get one that will fit the center swivel bolt? Should a washer in there tighten things up? There doesn't appear to be any excessive wear on the base or center swivel but then again I know I don't know what I don't know. Anyway onto the pictures (Imgbb has changed since last time I used it so bear with me here).
So here's the vise on the bench, it's opened up all the way with the screw out of the nut.
Here are the markings under the jaws.
Here's the underside of the base. You can see the damaged swivel lock nut and the center swivel nut which looks fine but has a bunch of play.
Now these here are odd, they fell out of the sliding jaw. Are they some sort of shim? Are they negative material cut from something that got stuck in there? I just don't know! LOL But knowing I don't know what I don't know I'll play it safe and ask.
There it is, for all its faults it's not bad. It's a decent vise from a good manufacturer that just has issues. Little will make me happier than to get it to the point where it's able to be used effectively, I just don't really don't know where to go from here.