I've got some really good Mac knives that I bought on Ebay. Several of them were chipped and most needed serious work on the cutting edge. I started with a grinder to remove the damaged areas, then used a fine stone to cut a smooth surface, and followed up with a set of diamond sharpeners to set the new edge. It was worth the effort!
Why do so few teach their kids how to sharpen tools properly? I've seen absolute messes made of axes, screwdrivers, planer blades, chisels, and wood lathe tools.
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