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The diamond is to even it up. I typically join the edge and then start over on the 1k chosera. The plate doesn't leave heavy scratches which you would find with lower grit plates.

When I used to hone alot I used to use a 6 micron (4k equivalent ) DMT for some of these. Cuts faster than a chosera 1k believe it or not. I did a few Japanese westerns that I had a very hard time...

C135 is pretty hard steel. A diamond plate would make the job go much faster as it will cut that steel easily. You only have to do it once.