HIROBO HI0404507 SX Root End, rotor linkage replacement  [HI0404507]

SX Root End replacement

This HIROBO HI0404507 SX Root End is an RC-scale root end designed as a serviceable replacement for SX series rotor linkages. It serves as a small but critical connector at the root of control linkages, providing the mounting interface between the rotorhead link and the tail/servo linkage in compatible helicopter assemblies.

The part is listed under common replacement parts for Eagle/Freya/EX/SX platforms, so use it where the maintenance schedule or crash repair requires swapping worn or damaged linkage endpoints. The component is intended for model-level work only and supports routine inspections, alignment checks, and linkage endpoint adjustments during setup or field maintenance.

Installation notes: fit the root end into the matched linkage rod end and secure with the original retaining hardware, then verify free movement across the rotorhead sweep and minimal lateral play. During tuning, check collective and tail linkage geometry after replacement to keep trim and tracking within established settings.