The Tamiya 3451594 cooling fan post serves as a dedicated mount on 42391 TRF421X assemblies, securing the fan in the correct position relative to the motor and electronics. This keeps airflow targeted over key areas of the TRF421X chassis.
Use this post when the original mount has failed or when you want to try a different fan location to influence cooling. The product listing is for the post itself; confirm pack contents with the retailer.
From a tuning perspective the post makes it easy to experiment: it fixes the fan position so you can alter orientation and spacing without changing other chassis components, helping rapid adjustments at the track or in the workshop.
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