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You sharpen the secondary / backbevel (the 15 degrees) when you do not get that hair-popping sharpness form the 20 degree angle. Or you use the 15 degrees to get a knife with a thick bevel to razo...
Answer
You sharpen the secondary / backbevel (the 15 degrees) when you do not get that hair-popping sharpness form the 20 degree angle. Or you use the 15 degrees to get a knife with a thick bevel to razo...