Hold the cable, to prevent it from slipping from its guide wheel (9). b) Adjust the screw (2) until, with the control (6) in contact with the eccentric (3), the butterfly is on the point of sticking in the housing duct. c) Unscrew the screw (2) slightly and tighten the lock~ nut (4). d) Connect the accelerator cable, to the control me- (6) at « b », and attach the spring (1) to the throttle housing at « a ».