Interesting, you just reminded me of something that has been staring me in the face for 35 years. I have a set of knives that I use often, I picked them up when I was cutting meat, some steel blades some stainless the only one in the draw that doesn't have a great edge on it is that last one I had sharpened. We always joked with the guy used to sharpened the blades, they never looked like they had been sharpened, but go ahead and drag you finger across it. He took on a new guy to sharpened, we all got our knives back and he had ground a new edge on them, they didn't hold up for sh*^*^t.I can sharpen a blade with a good file in a few stroke myself. I leave blade on push mowers and just tilt them a few strokes it'll slice your finger right off.