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It can be done without regrinding it. The edge has alot of wear and is uneven but can be done with a 4K or 1K. Probably some circular honing to even things out and then you'll have to reestablish the...

The real question is does it still have a complete bevel on it or is most of it gone. If it still has one it should be able to be evened out with honing. regrinding is a real 800lb gorilla approach...