Wing nut
thingiverse
Это маленькая гайка-барашек, которая прижимается обычной гайкой M3 на болте. Удобнее затягивать подвижной элемент на держателе. It is a small wing nut that is held by a regular M3 nut on a bolt. It is more convenient to tighten the movable element on the holder.
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