This Futaba FU1K12801 servo horn cross-arm set contains 2 pcs intended as replacement or spare linkage arms compatible with Futaba servo models. It is an RC-scale accessory that mounts on D5mm style servo output shafts and provides a stable connection point for steering and control linkages.
Key practical notes: the package does not include packing or mounting screws so source suitable retainers and fasteners, confirm spline alignment before final tightening, and verify the horn's neutral position during setup to prevent binding. As this is a mechanical linkage item, installation and tuning should focus on reducing play and achieving correct throw and geometry rather than electronic adjustments.
Installation tips: install one horn at a time to check center position, secure each horn with the appropriate hardware for a D5mm interface, and test movement range at low transmitter input to confirm smooth travel. For trim tuning, make incremental linkage length changes and re-check steering centering and endpoints.
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