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I can't find the name for this kind of hole. It allows the release of the plate by just loosening the bolt a bit, without having to remove it completely.

Searches using "teardrop" or "hole with oblong" do not return the desired results.

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I would call that a 'key hole'.

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    $\begingroup$ Yup, everything I can find calls them "keyhole slots". $\endgroup$ – JMac Feb 1 '17 at 21:53

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