Some time ago ChrisL and Utopian both recommended the DMTXX 120 for lapping hard barber hones. I bought one and it is a heckuva tool. If I have a water stone that shows it needs a lot, by looking at the pencil grid after a few strokes on the 325, I go to the XX. Get the hone flat and then draw another grid and knock the scratches left by the 120 off with the 325. I don't use it on all of them, only when it really has a ways to go.