These Yokomo ZS-508S Differential Adjusting Screws are an RC-scale replacement part intended for on-road differential tuning and maintenance. They function as the threaded adjuster component used to set preload and influence torque transfer inside a differential assembly, giving a predictable mechanical interface for setup changes at the track or in the workshop.
The screws are intended to be fitted into compatible R/C differential housings or carriers in place of factory adjusters. Installation requires access to the differential internals, removal of the original adjuster, and careful reassembly while keeping internal gear alignment and lubricant condition in mind. Use appropriate small hand tools and moderate torque when seating the screws to avoid thread damage.
In tuning, these adjusters give a simple way to alter preload and the effective engagement of the diff; small incremental turns change behaviour noticeably on high-grip surfaces. Pair adjustments with observation of handling and lap times, and always verify smooth gear mesh and bearing condition after reassembly. As with all R/C drivetrain work, treat this as a model-scale component only and ensure compatibility with your differential before fitting.
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