I have a bench vise that can rotate something like 270°. The problem is that the clamp that's supposed to stop it from rotating seems to only work in one direction. I can crank as hard as I can on the handle - really reefing on it. Yet, the vise will still rotate.
Here's a picture of the vise with the handle in question:
On the bottom there's a square head on the bolt that looks to have an ACME thread. My thought was that I could just grind down a bit off the end of the bolt and that should let me tighten it a lot better against the base of the vise. Does that seem like a bad idea? Are there better ways to keep my vise from rotating?
Here's the bolt and the underside of my vise: