Master suspension arm assembly for your RC off-roader! This guide covers steering knuckle & pillow ball mount setup: installing bearings in correct orientation, securing screws with washers, and ensuring symmetrical alignment. For front arms, install pivot balls, shimmed screws, and tighten sequentially. Rear arms require axle carrier bearings, pivot balls, and precise shimming to maintain drivetrain alignment. Pro tips: Apply threadlock, check pivot movement, and verify symmetry for optimal steering response and durability.