Muscle-powered rotary weed whacker

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A rotary weed whacker using a linear-to-rotary power mechanism, as used in salad spinners and toy cars. I'm not a farmer but this seems like something which readers here could develop quickly; thanks for having me. I assembled this tool with an actual salad spinner mechanism, which does not provide enough rpm; but a higher-geared mechanism with a flywheel design might, I suspect, work. A few more details are at my reel mower blog, https://reelmowerrally.wordpress.com/ Thanks again.
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