Hirobo HI0301023 XRB EX M4 Ball Link  [HI0301023]

M4 ball link for XRB helicopters

This is an RC-scale replacement ball link listed under Hirobo XRB parts, intended for use with XRB EX series helicopter linkages. The component is presented as a direct spare part designation HI0301023 and is intended to restore or maintain ball-end linkage function on scale models.

Installers should treat the part as a like-for-like replacement: remove the worn ball link assembly, confirm thread engagement matches M4 fittings on the control arm or rod, and secure the connection so the ball joint retains free articulation without play. Avoid forcing mismatched components and verify smooth movement through the control throw after fitting.

From a tuning perspective, swapping ball links can affect control geometry and servo-to-linkage geometry. Use this part when replacing worn joints or when reverting to original linkage dimensions during setup checks, focusing on restoring correct articulation and repeatable response rather than altering travel ranges.