A good buddy of mine, Ed Lombi, made the prototype, and the early Tom Brown Tracker knives. He still has a couple and they are big knives. He was a machinist in his younger days and I've picked his brain about sharpening and metallurgy. Anyway, he can and does sharpen large knives with one of the those 4x4x3/8 or so square synthetic stones. Doing circles. First time he showed me I was incredulous. I figured that cannot be right. Wasn't long after that Lynn posted the first video of honing razors with circles.