HIROBO HI0404532 Linkage 5mm Ball Radius Pin for Eagle/Freya/EX/SX  [HI0404532]

5mm ball pin for helicopter linkages and controls

This 5mm ball radius pin is supplied as a replacement component for HIROBO helicopter assemblies across the Eagle, Freya, EX and SX platform lines. It acts as the pivot between ball cups and linkage rods, providing the articulation point in rotor and control linkages.

Replace the pin when ball connections develop slack or erratic inputs. It is intended as a like-for-like part within the common parts grouping for the listed platforms and should be paired with the original ball-head and retaining hardware from the linkage.

Installation tips: detach the linkage assembly from the frame to reach the ball joint, examine the mating surfaces for scoring or deformation, and align the pin through both the ball-head and linkage eye before refitting retainers or fasteners. Verify unobstructed movement through the complete control sweep and swap any worn cups or bearings as needed.

Effect on setup: a new ball radius pin eliminates play at the joint, aiding in predictable control authority; because small joint geometry changes influence control feel, make incremental trim corrections after installation.