TRF421X Adjustable Damper Stay Mount 42391 / 3451584 Tamiya  [3451584]

Adjustable stay for TRF421X setups

This RC damper stay is sold under part number 3451584 by Tamiya and is intended for use with the 42391 TRF421X chassis. It serves as the shock mounting point and replaces the original stay on compatible TRF421X builds.

The stay controls where shocks mount and their effective angle, giving a direct way to modify leverage and suspension geometry without changing arms or towers. In tuning work it is commonly used to try variations in shock angle and mounting height to influence transient response and roll behavior on 1/10 scale touring cars.

Fitting is straightforward for standard TRF421X assemblies: remove the factory stay, transfer any spacers or bushings you need, and fit the replacement using the chassis' existing screw locations. No modification to the chassis is needed when installed with the intended TRF421X components, but always check alignment and screw engagement while reassembling.

Install this stay when you want to adjust shock geometry in a reversible, component-level way on TRF421X cars, focusing on tuning rather than replacing larger parts.