This is an RC replacement seesaw pin designed for the seesaw assembly on the Hirobo Eagle SX helicopter model. The part is identified by Hirobo as HI2509010 and is supplied as a single replacement element for maintenance and repair of the seesaw linkage path.
In use the pin locates the seesaw pivot and preserves linkage geometry, which influences tail pitch response and overall trim. When servicing or tuning the Eagle SX, inspect the pin for wear and fit this HI2509010 to maintain proper pivot alignment.
Installation is straightforward for hobby-level technicians: remove the head assembly access as required on the Eagle SX, align the seesaw holes, and press the pin into its original seat until fully seated. After fitting, confirm free pivot movement and re-check control linkages before flight. This information covers RC helicopter maintenance and tuning practices only.
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