HIROBO HI0404532 5mm Ball Radius Pin for Eagle, Freya, EX and SX Linkage Repair  [HI0404532]

Rotor linkage 5mm ball radius replacement

This 5mm ball radius pin is offered as an RC replacement for HIROBO helicopter assemblies across the Eagle, Freya, EX and SX platform families. It provides the small pivot point between ball cups and linkage rods, essential for accurate rotor and control motion.

Replace the component if a loose or damaged ball joint is creating control slop or inconsistent inputs. The part is intended as a direct substitute within the common parts group and should be used alongside the existing ball-head and retention hardware.

Fitting notes: detach linkages from the airframe to reach the joint, inspect mating faces for wear, then thread the pin through the ball-head and linkage eye before refitting clips or fasteners. Check for full-range, smooth articulation and renew any worn cups or bearings discovered during inspection.

Performance impact: fitting a new ball radius pin removes excessive play at the joint and aids predictable control behaviour; because joint geometry influences feel, make small trim adjustments and verify handling after installation.