Quote Originally Posted by khaos View Post
Let me add a disclaimer, I've never used a DMT. I'm just saying, 300ish grit is pretty good for most rocks, but trust me, you're gonna want somethign rougher, either for cheap stones you want done fast, or for stones that will eat other things (I'm pretty sure that Swatys and Carborundum hones are synthetic "corundum" or at least very similar, and on the Moh's scale corundum is a 9, with diamond at 10.)
I do have a norton flattening stone. I got this used and it was definitely not flat when I got it, in fact I am still not 100% sure it's flat now, but my arms got tired of trying to lap it completely flat. first on a cinder block then 80 grit sand paper.

I wanted something that started out flat and would stay flat so I thought the Duosharp stones would do the trick.