This is an RC-scale replacement drive shaft set specified for HPI Bullet MT models, supplied as a 2pcs kit from JAZRIDER with model code BUL-18012-BK. The parts are produced in black steel to serve as a direct replacement for front and rear universal shafts on the Bullet MT chassis, intended for routine maintenance and drivetrain reinforcement in off-road RC use.
The shafts are designed to be swapped in place of worn stock units; installation requires removing the current universal shafts, seating the new shafts into the same coupling locations, and securing the retaining hardware while maintaining correct alignment. Inspect related components such as hex adapters and wheel hub mating faces before fitting to ensure proper engagement and prevent binding.
In tuning terms, replacing standard drive components with black steel units like these is a practical way to restore drivetrain integrity after wear, and to provide a consistent interface for other drivetrain upgrades. After installation, verify free rotation through the suspension travel range and confirm there is no excessive play at the joints.
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