butterfly nut

Example Sentences

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Two thirds of the length was threaded and fitted with a "butterfly" nut in front of which was a cylindrical plug of guttapercha faced with indiarubber.

From Project Gutenberg

The flight-lieutenant's next move was to screw the pliable plug hard against the perforated metal by means of the "butterfly" nut, and by so doing hole No.1 was repaired—the first of six.

From Project Gutenberg