VEVOR 1A-CS110 Manual Del Usuario página 18

First sharpen the blade, sharpen the knife, and then sharpen the blade to
remove burrs from the blade. The order must be correct, otherwise the
blade will be damaged.
GENERAL SAFETY PRACTICES
1.Loosen the knob
2.Rotate 180° clockwise
3.Press the button below to sharpen
4.Press the button above to sharpen
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the blade
the blade