Tungsten Carbide Blades put a quick sharp edge on dull or damaged knives. The carbide blades are reversible for extended life.
Remove the Phillips head screw(s) and save for re-assembly.
Remove the plastic cover and save for re-assembly.
Hold sharpender in hand with head facing down. Insert one of the carbide replacement blades into the left-hand cavity and then place the other blade into the right-hand cavity, which will be on top of the first blade. The blades should form a "V" in the middle. Both blades are designed to be interchangeable.