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I know very little about this so a question- "the vertical lines are from a grinder? Did they ever look like this from being ground by hand on a grinding wheel?"

I have a few older blades that...

When I hear the word "re-grind" or "re-ground" it makes me think of some serious sparks flying and heavy steel removal on a grinding wheel. Not touching up the blade with high grit sand paper. A nice...