This Futaba FU1K12901 D5mm servo horn circle is supplied as a pair and serves as a direct replacement or tuning accessory for the listed Futaba servo arms. The item is offered without packaging or screws, so you must provide suitable fasteners and any mounting hardware yourself.
Compatibility note: the product name lists S3103, S3107, 3153, 3156, and 3157 as compatible models. Verify the spline profile and D5mm bore on your servo before fitting to ensure correct engagement and travel. Do not assume compatibility with servo models not shown.
Fitting guidance: remove the existing servo arm, seat the D5mm horn circle onto the servo spline, position it for neutral travel, and secure it with an appropriate screw or retaining method that you supply. The part acts as a linkage point to adjust leverage or fine-tune steering and control throws on small-scale RC models.
Practical advice: this is a simple replacement/tuning component rather than a full servo unit. Use an appropriate threadlocker or locking method where needed, and re-check full travel after installation to prevent binding or overtravel.
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