Precision Mini 4WD Shaft Stopper M4WD-38/BL Machined Collar by 3Racing  [M4WD-38/BL]

Technical overview of the M4WD-38/BL shaft stopper

The M4WD-38/BL is a machined aluminium shaft stopper supplied as a single collar to replace standard plastic retainers used on many Mini 4WD chassis. Its black anodised surface and turned profile are specified to provide reliable seating and improved wear characteristics without affecting core drivetrain geometry.

For builders who demand repeatable fitment during frequent disassembly, the aluminium collar reduces compression and deformation typical of aged plastic stoppers. The stopper installs using the same seating method as the original part in most MA, MS and AR style configurations.

Functionally the collar constrains axial play of axle and gear shafts and establishes a consistent seating datum for bearings or bushings. It is suitable for restoration, maintenance replacement, and any application requiring durable stop features while preserving original spacing and alignment.

Install with basic hobby tools, control fastener torque to prevent distortion of mating parts, and verify axial clearance after fitting. The component does not alter gear ratios, motor selection, or primary drivetrain layout; normal setup procedures remain applicable.