This Hirobo root end, listed as HI0404553, is supplied as a service replacement part for Eagle, Freya, EX and SX helicopter lines. It functions as the terminal link in tail linkage assemblies where a compact, serviceable joint is needed for routine maintenance and part renewal.
Fitment details note that this item is used across Eagle/Freya/EX/SX models; always confirm the part number on your airframe before ordering. The product is sold as a single replacement component intended to restore correct linkage geometry when an original root end shows wear or excessive play.
Installation and setup tips: remove the worn root end from the tail linkage, inspect adjacent pushrods and bearings for wear, install the new root end in the correct orientation ensuring free movement, then check tail pitch and yaw response at low throttle. Carry out minor trim adjustments if required to re-establish neutral linkage alignment before full-power flights.
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