Update on the Morgan 135: The main nut was very loose in its channel, drifting at least 1/4" back and forth and causing a lot of slop in the screw. The nut lock pin was a bit mutiliated so it was a pain to punch out, but I have it mostly apart now. I also discovered that someone DID abuse this vise and broke the swivel lock bolt (it was booger welded together) as well as the swivel base itself (also welded). Anyone know if Milwaukee Tool sells individual replacement parts for these old vises? They still show the 135 as current production so I'm hoping the new parts are interchangeable with the old models. After cleaning up the main nut channel and main nut itself to figure out exactly where the slop is, I'd like to possibly get a new main nut, nut lock pin, and jaws; maybe even a new swivel base, but I imagine that will be somewhat pricey.
Also, the main body and dynamic jaw are in great shape, no breaks, cracks or welds. However as-is, the top of the jaws contacted before the bottom. Any ideas on troubleshooting why it the jaw faces would meet at an angle like that? I'd love to save this vise and get it back to tip top shape.