The Futaba FU1K12901 D5mm servo horn circle is a two-piece accessory intended for replacing or tuning the arms on the listed Futaba servo models. It ships without packing or screws, so mounting hardware must be sourced separately.
Compatibility: the listing identifies S3103, S3107, 3153, 3156, and 3157 as compatible. Always confirm the spline fit and the D5mm bore on your servo before attempting installation to ensure correct operation. Do not assume it fits unlisted servo models.
How it is used: remove the existing arm, press the D5mm horn onto the servo spline, set the arm to neutral travel, then secure with a suitable screw or retainer you provide. It is designed to act as a linkage point for adjusting servo throw and mechanical advantage on small RC platforms.
Durability note: this is a basic replacement component, not a reinforced upgrade. Consider threadlock for metal-to-metal joints and check full-range movement after fitting to avoid rubbing or excess travel.
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