I picked up this whopper of a vise (50+ pounds) with the intention of stripping the paint and knocking off the rust. I'd be curious to see if anyone can ID the model or year. Anyway, I've disassembled most of it, but the base has a 1.5" bolt head on the bottom side that appears to be holding a threaded bolt in place. I can't see under the bolt head. Does anyone know if it can/should be removed? Photo 3 shows a closeup of the bolt head and the small space beneath it. Photo 4 shows the top side of the bottom plate and the threaded rod that holds the static jaw piece.
There's also a long set screw (1/8" hex head) threaded through a nut at the rear bottom of the static jaw piece. What does that do?
Thank you for your input.
There's also a long set screw (1/8" hex head) threaded through a nut at the rear bottom of the static jaw piece. What does that do?
Thank you for your input.

