Once the magnet's force is reduced then the user can slide the sharpener free from the restricting geometry.
And voila! The sharpener is free to use.
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SOG Hunter Revolver

This is was an interesting project because we face-lifted an existing product and gave it an enhanced feature. Sadly this feature isn't even talked about but I think it is really really cool. Using a magnet and some simple geometry we developed a quick, easy and extremely effective retention method.

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Beren McKay
Product Development Engineer Seattle, WA