HIROBO HI0404532 SX 5mm Ball Radius Pin for Eagle/Freya/EX/SX Helicopter Common Parts  [HI0404532]

5mm ball radius pin for helicopter linkages

This 5mm ball radius pin is an RC-scale replacement part listed for common Hirobo helicopter assemblies used across Eagle, Freya, EX and SX platforms. It serves as a small pivot pin for ball-head linkages and control joints, providing the mechanical interface between ball cups and linkage rods in the rotor and control systems.

Use this pin when a worn or damaged ball connection is the source of slop or inconsistent control response. It is intended as a direct replacement component within the common parts group for the listed platforms, and it should be fitted with the matching ball-head and retaining hardware already present in the linkage assembly.

Installation notes: remove the linkage assembly from the airframe to access the ball joint, inspect mating surfaces for wear, and align the pin through the ball-head and linkage eye before securing any retaining clips or fasteners. For best results, confirm clearance and smooth articulation through the full control travel, and replace any mating cups or bearings that show excessive wear.

Tuning role: replacing a worn ball radius pin restores tightness at the joint, which helps maintain predictable cyclic and pitch authority; small changes at the ball joint can affect control feel, so make incremental adjustments and verify trim after installation.