TRF421X Micro Spacer 3.0x4.0x2.7mm Compatible Part - Tamiya 9803571  [9803571]

Accurate 3.0x4.0x2.7mm micro spacer

The Tamiya 9803571 spacer is an RC hop-up designed to give precise spacing control in TRF421X-related assemblies. Included alongside reference 42391, it is intended for repeatable, small-step adjustments where tight tolerances are essential, such as bearing seats, linkage pivots, and chassis mounting points.

Fit the spacer to correct axial play, set correct gear mesh clearance, or make subtle suspension geometry changes without major replacements. With nominal dimensions of 3.0x4.0x2.7mm it is suitable for confined positions typical of touring car chassis and specialist hop-up work.

Installation is straightforward: check the part orientation, slide the spacer onto the shaft or into the bore, and reassemble. Avoid over-constraining bearings and check for binding by hand rotating the assembly before running.

When tuning, incorporate this spacer as one incremental tool to adjust handling balance. Tiny adjustments in spacer thickness or stacking height can modify roll center, toe link geometry, and drivetrain mesh, so note each change and trial on track to assess handling and efficiency.