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The reason to avoid 1K unless absolutely necessary is that "Damascus steel is a terrible thing to waste".

If the Livi has been shaving well, I'm not sure I would do anything at all. I have one as well and have seen the same thing. I had to stop looking at it under 10X because it was still shaving nicely.

I would go back no further than I had to and would start at 4K to preserve steel, especially if it is Damascus. You can always go back to 1K. If you find that 4K doesn't work, then go to 1K. It is...