Tighten the wing screw by hand until it is snug.
蝶ねじを手で回して、しっかり締めてください。
手で回して適度な力で締める羽根付きねじ、蝶ねじ
A fastener with two opposing wing-like tabs on the head that permit tightening or loosening by hand without a tool.
wing screwは、wing＋screwの合成語で、wingは頭部の突起を、screwは回転で締めるねじ本体を表す。
