The Yokomo B9-118GPA Aluminum Battery Guide Post is a precision part made for the BD9 chassis. It lets racers and hobbyists tweak chassis flex to refine handling and stability, while the anodized aluminum build gives robust service life under regular track use.
Fitting the guide post to the upper deck and adding or removing a spacer changes how the BD9 flexes. That simple setup allows quick adjustments to the balance between stiffness and compliance to suit different track layouts.
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