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Proximus, IMHO I think you are right on the money in your estimation. You may be off by 1k +/- but either way you got the overall picture of it's approximate usage. Super dull, the low grit side,...

Holes are not a problem, it is uneven surface that is the problem. Small shallow holes will not touch the blade, hence they are not a problem. Some hones in the old days were made with planned...