See: Serpent

Serpent have introduced new aluminium clamping servo horns for the Spyder SRX2 Gen3. the single sided servo horn is made of high-quality aluminium for a great precision, rigidity and durability and comes grey anodized with silver chamfer edges. The servo horn features a clamp type design that grips the servo’s output shaft so if the retainer screw comes loose, the horn will have a better chance of remaining in place. The aluminium clamping servo horns are available in 23T and 25T splines and include a button head screw.