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An Unusual Design for a DIY Spring-Action Knife Sharpener
Turning the results of a shop accident into a useful device
This is a very creative way of turning lemons into lemonade. John Heisz accidentally dropped and broke his oilstone, rendering it useless. But then he devised a way to repurpose it by cutting it up and building a spring- (actually sponge-) loaded contraption to turn it all into this nifty knife sharpener:
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