The Kyosho MZW412B SP Long King Pin Ball Set lets MR-03 owners refine steering precision for tighter lines and steadier high-speed control. It replaces the original king pin balls to remove unwanted play and improve response.
Specifically built for the Kyosho Mini-Z MR-03 family, this set matches the series steering components. It is suitable for racers and hobbyists who want more reliable steering performance on varied surfaces.
Installing the MZW412B requires only standard RC tools and a clean workspace. Fit the new balls carefully, check steering travel, and perform a few low-speed runs to confirm setup before a full session.
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