This Arrowmax AM-MRX5-H0756 component is an RC-scale thrust bearing stopper produced for MUGEN MRX5 platforms, supplied in spring steel to withstand repeated loading without permanent set. It functions as a compact retention item that restricts axial travel of thrust bearings inside the differential or transmission stack.
In use the stopper helps preserve bearing face alignment and reduces axial play that can disturb gear mesh during rapid acceleration or when taking bends. The part is intended for hobby-grade 1/8 and 1/10 scale electric touring and racing cars using the MRX5 chassis family where a small thrust retention element is needed.
Installation is simple for those familiar with diff servicing: remove the differential, identify the thrust bearing position, fit the spring-steel stopper to achieve the required preload and axial limit, then reassemble. Make measured adjustments to stack height and preload and verify gear alignment on the bench.
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