The Yokomo R12-12U is intended as a direct swap for the front upper suspension arm locating pin on R12 and GT series chassis. Proper arm location is critical to how camber and roll center behave under load, so this pin plays a small but important role in handling.
Fitting is routine: remove the wheel, gain access to the upper arm mount, and replace the pin. After installation verify there is no free play and that the arm pivots correctly through its travel.
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