The greatest advantage to the Spyderco manual knife-sharpening system, which can sharpen both straight and serrated blades, is its ability to restore dull knives to sharpness without removing too much metal. Although the… Sharpmaker takes up to eight times longer to produce a sharp edge than other manual sharpeners, reviews say that this system is flexible, well designed, stable and practically foolproof -- once you learn how to use it. Reviews say that the Sharpmaker's accompanying training manual and video are excellent but complex. The Spyderco knife sharpener works for pretty much all types of knives and scissors, including serrated and honed-edge hunting knives as well as kitchen knives.
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