The Yokomo R12-12U is a direct replacement front upper suspension arm pin made for the R12 and GT series chassis. As the small but vital link that locates the upper arm, this pin plays a role in roll center and camber behavior when setting up the car.
Fitting the pin is simple for most hobbyists: remove the wheel, access the upper arm mount, and swap the worn pin. Keep mating surfaces clean and confirm there is no unwanted play after installation.
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