This kit supplies three Futaba FU1K17401 Type-N circle servo horns designed for use with Futaba S9150/52/53/54 and BLS154/BLS174 series servos. The part is supplied without mounting screws and is intended as a spare or tuning accessory for scale RC models that need quick changes to linkage geometry.
Installation is straightforward on splined servo output shafts: align the horn to the servo spline, set the servo to its neutral position, and secure the horn using an appropriate screw from your servo manual or existing hardware. Because screws are not included, use the original mounting screw or a matching-size fastener to avoid damaging the spline or horn.
From a tuning perspective, the Type-N circle horn changes the effective lever arm and ball link positions, so you can refine steering sensitivity, travel and centring without altering software endpoints. Make small adjustments and test on the bench before full-range running to verify travel and prevent binding.
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