This clamp comes straight out of Joe Keeslar, MS Handles & Guards book and is shown to everyone who takes that ABS class. I searched around for the right wood crafting clamp for a while before finding the right on. The slit in the clamp is 1.25 to 1.5" depending on the size of the knives you make. I make my slit .25" wide. I use a mini hacksaw for the guide cut and a .25" round rasp file to complete the cut. I cut the slit in the pad after I have finished the base cut.
Hope this helps any new knife makers out there.
"Remember a Sharp knife is a Safe Knife!"