Galbreath is the main guy doing the Picco P0 stuff. It gets over $200, I think Toad tried some cranks too. I don't think the heat treating helped a whole lot. It was just a bit too thin, it would break in the port window, sometimes the prop would pull the front of the crank right out. I was going to use A2 steel, and press in a hardened crankpin. I have a Hardinge Chucker lathe, .0005" is repeatable in most cases, and .0002" is kind of doable if time is no object. I am more worried about indexing the port window in the crank than the shaft dia size. I think if the crank bore is smaller than the stock on, and a oval bellmouth is used, kind of like a turbo style crank, that something might work ok. The Fora .049/.06 does that on the crank.