Technical note: The JAZRIDER JR-OT06 swing drive shafts are precision aluminium components intended to replace the standard swing shafts on Kyosho Optima 2016 models. Machining tolerances are optimised for accurate fitment with existing optima hubs and retainers. Use standard hex tools for installation and verify torque settings. Regular inspection of mating interfaces and light lubrication will maximise longevity and maintain drivetrain alignment.