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I use hand grinder with ceramic, dressed grinder disks. Same disc I use to cut chains and clearing saw blades. It takes some practice and they easily blow up from vibrations that easily come if you don't pay attension to what you do. But worth it as they don't temper cutter and change hardening...

I sharpen them sometimes but its not always possible as they are hardened. When I do I make sure there is no burr or uneven surface that they can snag. If there is it often lead to larger costly repais as broken gearbox etc. Wear is a thing to look at... If they are good and sharpened right...