HIROBO HI0404521 SX lever shaft set for Eagle/Freya/EX/SX RC helicopters  [HI0404521]

SX lever shaft replacement component

This lever shaft set is an RC-scale spare intended for use with Hirobo Eagle, Freya, EX and SX family models listed in common parts catalogs. The write-up focuses on fit, installation context and how the part fits into control and tail linkage maintenance without asserting unprovided material data.

The set is used to replace worn or bent lever shafts inside the collective and tail control linkages, restoring smooth pivot action and reducing play in linkage joints. Fitment depends on matching the original shaft locations and retaining hardware, so inspect the rotor head and control arms to confirm alignment before final installation.

Installation overview: remove the affected linkage assembly following your model's disassembly steps, transfer any usable bushings or bearings, and fit the new shaft ensuring free rotational movement without binding. Reuse original fasteners where appropriate and check servo horn and control rod engagement after reassembly. Final trimming and cyclic balancing may be required to restore precise control response.