There may be a smarter way to sharpen your mower blades than using a metal file

A metal file has been the traditional way to sharpen your mower blades for a long time, but there might just be a better way.
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Skip the metal file: There's a smarter way to sharpen lawn mower blades

Many people sharpen lawn mower blades themselves using a handheld file. That works, but there's a compact, affordable power tool that does a better job.