Bought on the advice of an article in Popular Mechanics magazine. It seemed ideal for sharpening things at work or in remote locations where you don't have all your usual tools, electricity, etc. I've noticed some complaints about this. I don't have such a problem with it. To test this, I sharpened a lawnmower blade. It worked. Obviously a bit more work than an electric grinder. I did this to test feasibility. I believe it will work in all these weird cases. It's small enough to fit in your tool bag and use just in case.
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