The Futaba FU1K12801 servo horn cross-arm set ships with 2 pieces designed as replacement or spare linkage arms for the listed Futaba servo models. It fits D5mm style servo output shafts and gives a firm mounting point for steering and other control linkages on RC models.
Practical notes: mounting hardware and any packing material are excluded from the box, so obtain suitable fasteners separately, align splines correctly before final clamping, and confirm the horn is centered at neutral to avoid mechanical binding. Because it is strictly a mechanical linkage component, focus installation on reducing lash and getting the correct mechanical throw and geometry.
Fitting advice: fit one horn and check neutral position before fitting the second, use screws appropriate to the servo spline and D5mm interface, and operate the control surfaces slowly during the first tests to verify smooth travel. For endpoint and trim adjustments, change linkage lengths in small steps and re-evaluate centering.
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