For Futaba Standard Servos Six-Arm Type-B D6mm Servo Horn FUSHORN-B 4pcs (w/o screw)  [FUSHORN-B]

Flexible six-arm D6mm servo horn

This Futaba FUSHORN-B six-arm Type-B servo horn is an RC accessory that offers multiple mounting arms to fine-tune servo linkage geometry. The Type-B layout and D6mm spline interface fit Futaba standard servos and let you change mechanical leverage without modifying the servo itself.

The pack contains 4 pcs of identical six-arm horns, sold without mounting screws. Each arm gives a different throw radius so you can adjust linkage ratios quickly during setup. Use matching screws and hardware sized for your servo case to avoid damaging the spline or horn.

Installation is straightforward: remove the servo horn screw, align the D6mm spline with the servo output shaft, set the servo to neutral, then secure the screw (not included) while holding the horn in the chosen orientation. Check travel endpoints and trim in your transmitter before final tightening to prevent binding.

For tuning, pick a longer arm for increased throw with reduced torque feel, or a shorter arm to limit travel and increase apparent torque for finer control. The multiple arm positions make ratio changes simple during on-track or bench testing.