Genuine STAXX Part #28030203 WH-25S-H Rocker Arm Axle 685

Located in the trucks A frame the rocker arm axle is what connects the rocker arm to the trucks A frame, the axle passes from one side of the A frame through the torsion tube to the other side of the A frame.

2 circlips sit in either side of the trucks A frame to secure the rocker arm in place.

Fits Staxx models WH-25S-H, WH-30S-H

Part #14 on the diagram