The Yokomo YOKD064 aluminium spring cup is a small R/C damper component used to retain coil springs on many shock assemblies. It offers a hard contact surface so springs locate reliably during assembly and adjustment of dampers for different driving surfaces.
The part is intended for general compatibility with common shock designs that accept a separate spring cup. Check your shock's spring seat diameter and internal profile against the cup before purchasing, as fitment varies across brands and models.
Fitting the cup is quick: slide it over the shock shaft to set the spring at the right installed height, then rebuild the unit. Aluminium resists deformation from repeated handling and helps keep preload and end-stroke response consistent across servicing cycles.
When tuning, a consistent seat reduces spring tilt and uneven wear, which makes step-by-step suspension changes more predictable on the bench and easier to evaluate trackside.
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