This Arrowmax AM-MRX5-H0756 component is an RC-scale thrust bearing stopper made for MUGEN MRX5 platforms, supplied in spring steel to resist elastic deformation under repeated loading. It acts as a small retention element that limits axial movement of thrust bearings inside the differential or transmission stack.
On track the stopper helps keep bearing faces aligned and cuts down axial play that can disturb gear mesh during hard acceleration or tight cornering. The part is suitable for hobby-grade 1/8 and 1/10 scale electric touring and racing cars that use the MRX5 chassis family and need a discrete thrust retention piece.
Fitting is straightforward for anyone used to differential servicing: remove the diff assembly, find the thrust bearing location, then fit the spring-steel stopper to set the required preload and axial stop before reassembly. Make small stack height and preload adjustments and bench-check gear alignment as you go.
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