I have a Craftsman bench vise Model 391-5180. I've had it for 35+ years. It spent the last 10 or so in storage. It was used regularly prior to that. I was getting ready to remount it and put it to use but the swivel base is stuck- frozen? I can barely move the locking nut and when I do manage to rotate about 180 deg. worth, nothing frees up. I removed the center nut and the moving rectangular slide bar and see little if any corrosion there. Could something be cross threaded? I've been soaking with Kroil for about 8 hrs. so far. Can any one steer me in the right direction. If I can't free it up I'll just use it as a fixed vise.



