This is a purpose-made RC replacement seesaw pin intended for the seesaw assembly on the Hirobo Eagle SX helicopter model. The part number is HI2509010 as listed by Hirobo and it is supplied as a single replacement item for maintenance or corrective repair of the seesaw linkage path.
Functionally the pin positions the seesaw pivot and maintains the linkage geometry, which affects the tail pitch response and trim behaviour. During setup or tuning of the Eagle SX, check the condition of the pivot pin and replace it with the HI2509010 if wear or play is detected to keep correct pivot alignment.
Fitting the pin is suitable for the competent hobbyist: access the head assembly on the Eagle SX as necessary, align the seesaw mounting holes, and insert the pin fully into its original seat. After installation confirm smooth pivot action and re-check all control linkages before flight. This text is provided for RC helicopter maintenance and tuning guidance only.
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