I think too often guys go lap crazy with stones. I originally had a small collection of barber's hones and the only one I have left is the swatty 3 line. I found all of them to be pretty fine finishers. I had a Lil Devil which was the coarsest and it worked for lapping the others. My original point is I usually don't lap stones be they new or NOS as long as when I eyeball them they look straight and they hone good. Once they start to not perform then I worry about lapping.