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A crystal for the old cat's whisker raw galena crystal radios was a different item, the sweet spot on the crystal was tapped by the cat's whisker for an electrical diode to reduce the frequency of an...

I have used the Glass Barber Hone with assorted super fine grits. It works if all stages earlier were done well. It will not make a poorly set edge better. It can tune up a good edge with a polishing...