Sean, sorry for not answering sooner, been in the woods chasing those elusive whitetails.
Anyway, here's a picture. pretty simple but effective. The best way I've found for holding a blade to sand and work on. I have a knife vise but its pretty useless, this works better by far. I made the bench to where the little bench vise extends out and this really makes it a lot handier. The angle iron is just tightened down in the vise, I glued a piece of heavy leather on the iron just to add a little protection from the steel and then I put a piece of masking tape over that, I sand 1 side, remove the tape along with the sanding grit and then apply another piece of tape and start in on the other side. The vise grips do all the holding. Just leave the cutting edge inside the angle iron edge. Hope this helps.
Bill