This CNC-friendly aluminum shaft stopper is specified as an aftermarket spare for Mini 4WD drivetrains. Finished in light blue anodize, the component acts as a clamp-style axle locator and is not intended as a structural chassis element. The contact faces and body dimension are set to engage standard Mini 4WD axle diameters and common retainers; verify axle nominal diameter and trial-fit before final assembly to ensure correct preload and alignment.
The stopper is suited to racers and tuners who prefer metal retainers for consistent axle location and reduced wear on mating parts. Installation outcomes depend on axle profile and adjacent hardware; targeted material removal or calibrated shims can be used to fine tune axial position without affecting wheel runout.
When installing, avoid overclamping and confirm axial clearance with rollers, gears and bearings across the full rotation. Intended for experienced builders and competitive setups where repeatable geometry and small adjustments are part of setup work.