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Thank you for your question. The piece that sharpens is a stationary piece (similar to a whetstone) it is not plastic, so you simply draw the knife through the slot to sharpen it.
Sorry, there was a problem. Please try again later.How many strokes do you use to sharpen the knife?
Sorry, there was a problem. Please try again later.I must admit I have NOT tried to use the Knife Sharpener on the back of can opener. I bought it for opening cans and I have other means for sharpening my knives that do not include any plastic.
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