The M4WD-11/LB light blue stopper is a small replacement part made to limit how far rollers move when they hit track fixtures. Its bright finish helps you spot contact points quickly while checking front and rear roller assemblies.
This item is supplied as a spare contact rather than a performance part. Model builders who rotate parts between cars or keep a tidy spares drawer will find it useful for routine swaps and wear checks. No chassis or drivetrain changes are needed to use this stopper.
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