You can find flat stones at hardware stores, hunting supply stores, sporting goods stores, and through mail order. A larger stone will make it easier to sharpen most knives, especially kitchen knives. A polished edge cuts more easily. Avoid using an electric sharpener of any kind. They remove too much metal from the blade, and have a tendency to create a wavy edge that will not cut with a clean, straight line.
Some knives are impossible to put an edge on.
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