This Futaba FU1K12801 servo horn cross-arm set contains 2 pcs intended as direct replacement or spare linkage arms for compatible Futaba servo models. It is an RC-scale accessory designed to mount on D5mm style servo output shafts and to provide a stable connection point for steering and control linkages.
Key practical notes: the package excludes packing and mounting screws so retainers and fasteners must be sourced separately, confirm spline alignment before final tightening, and verify neutral horn position during setup to avoid binding. Because this part is a mechanical linkage component, installation and tuning focus on minimizing play and ensuring correct throw and geometry rather than electronic setup.
Installation tips: fit one horn at a time to check center position, secure with appropriate hardware for the servo spline and D5mm interface, and test movement range at low throttle or transmitter input to confirm smooth travel. For trim adjustments, make small linkage length changes and re-check steering centering and endpoints.
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