B
Bent index
傾斜緩急針／ケイシャカンキュウシン
弯曲微调器
Bent index
Raquette coudée
Glossary
Thematic
Regulation, Technic
The balance spring stud and curb pins are usually within a 90° angle. In a "bent" index, this angle is smaller to reduce the distance between the stud and the pins.