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I have also heard putting a piece of rubber mat under the anvil takes a lot of noise out it. Wood or metal stand I don't remember but your could hear the difference in the vid. I am still kind of...

IF you have a belt sander give that a try. I went at mine with the flap wheel on a 7" grinder and the belt worked easy to make it flat.
I also kept mine mostly cool with water while sanding. Looks...