I haven’t figured out how to get a good edge with stones. “it’s all in the angle” but without some kind of guide I can’t find the right angle. I tried marking the edge with sharpie, it helped a little bit still not as good of an edge as I get with other means.

On the flip side, I am a professional metallographer so I am extremely experienced in progressive polishing to insanely fine grits. I just don’t have a good feel or control of the angle. Metallography has to be perfectly flat.