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I had to look these up... know nothing about them.If I found the correct info...apparently it takes a special machine to actually sharpen them.But I did find a couple of videos, indicating they can be "touched up" on a flat surface... if not in too bad a shape?One that might be of interest...https://www.youtube.com/watch?v=HlvZNYrGsFM... the sharpener uses a flat diamond wheel for the task. So maybe the side of the new diamond wheel might be up to it?(But from what I read, if it needs more than a "touchup", a special machine/wheel is needed).Feel free to tell me otherwise... no 1st hand knowledge here.