After doing some more poking around, I found out the chisels are tapered 3 degrees from back to front, as you suggested. Thanks for setting me straight. Now my question is, does the taper cause a problem if you are using Paul’s mortise jig? It seems like if you are holding the side of the chisel tight against the jig, it would then be twisted 3 degrees to the wall of your mortise. Is that such a small amount that it doesn’t matter?