French horn lever spring.
Fits all Holton models:
- Holton H104 Tuckwell
- Holton H109
- Holton H177
- Holton H178
- Holton H179
- Holton H180
- Holton H181
- Holton H277
- Holton H278
- Holton H279
- Holton H280
- Holton H281
- Holton H378
- Holton H379
- Holton H602 Collegiate
- Holton H650 Collegiate