Lisspence / m98custom1212
What a tremendous resource this forum is !!!
I've passed up several bench vises offered at very low prices due to missing jaws or collars. In particular, I remember looking at a nice Parker at a Flea. When I first saw it, it was OK but the price was too high. On the way out, I stopped to look at it again - someone had dropped it on its nose and broken the collar! The price was now much lower, but still not low enough to compensate for the time needed to make a new collar!
The "teeth" on vise jaws can be freshened up with a hand-held triangular or knife-edged file. Though I've never tried it, they can probably be deepened with a hand-held graver as well.
John Ruth