For hobbyists wanting crisper handling from a TRF421, the Tamiya 9803482 Upper Arm Mount A/B offers a precise replacement option. It helps tidy up suspension geometry to improve predictability when pushing pace on club tracks.
The Tamiya 9803482 is made for direct mounting to the TRF421 chassis and installs with common RC tools. Built to support the upper arms reliably, it aids in smoothing handling transitions and improving corner entry control without complex setup changes.
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