XRB EX Replacement M4 Ball Link HI0301023 by Hirobo  [HI0301023]

M4 Ball Joint for XRB EX Models

This item is an RC-scale ball link listed for Hirobo XRB parts and intended for installation in XRB EX series control linkages. Identified by part number HI0301023, it is supplied to maintain or return ball-end functionality on model helicopter linkages.

When fitting, replace like-for-like: remove the defective link, verify the M4 threaded shaft engages cleanly with the control arm or rod, and secure the joint so the ball rotates freely without lateral play. Do not force an incorrect fit and confirm smooth movement through the full control sweep.

From a tuning viewpoint, changing ball links can shift servo alignment and throw. Use this part to recover original linkage geometry and consistent response rather than to extend travel or alter factory settings.