Then, along came a hack - someone discovered that flat-top carbide cutters could be resharpened using diamond hones - just rub the flat top on the hone. They were designed in a way that allowed the cutter to be rotated so that a single cutter could have a longer life, but in the end, carbide cutters were still disposable. The original concept of carbide cutters was that they were disposable - they were fairly long-lasting, you used them until they became dull, and then threw them away. The same principle applies to carbide cutters. Most everyone understands the marketing philosophy behind the Giletter razor - offer an inexpensive razor, and them make money by selling proprietary replacements blades. My response could trigger some contrary comments, but here goes.
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