SCREW, THROTTLE BLADE, MIKUNI, HEXALOBULAR SOCKET, STAINLESS STEEL. Use T10 driver. Torque to 1 NM (9 in-lbs.). Must be secured by peening the back side or applying a high strength thread locker during installation. For most people peening will not be an option, as it does require special tools to do so without bending or otherwise damaging the shaft. Regardless of the method, you must ensure they don’t come out (motolab will not assume any responsibility for damages caused by throttle blade screws that fell out and were ingested by the engine!)