also: ばねあなはり
noun
split-eye needle
A specialized sewing needle with a split eye that allows easy threading. Used in industrial sewing and handicrafts.
このミシンには弾機孔針が付属している。
This sewing machine comes with a split-eye needle.
弾機孔針を使うと糸通しがとても楽になる。
Using a split-eye needle makes threading much easier.
Compound of 弾機 (spring) + 孔 (hole) + 針 (needle), referring to the spring-like split eye that facilitates threading. The exact historical derivation is uncertain.