This light blue roller stopper, model M4WD-11/LB, is a compact spare designed to restrict roller movement where rollers meet track fixtures. It gives a clear visual reference on front and rear roller mounts to help spot contact wear during quick inspections.
Supplied as a replacement contact rather than a tuning upgrade, the stopper is aimed at hobbyists who keep a small spares kit or maintain several cars. No modifications to motor, gearing, or chassis are required to fit this part.
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