The cable goes into the top of the drive and there should be like a little flat screw driver end down inside. Thats what drives the cable.

On the other end of the drive there should be a plastic socket that is pressed onto the drive. This locates onto the bolt that hold the gear box sprocket on.

The sprocket turn the plastic socket. That then turns thought 90deg and drives the screw driver type blade which turn the cable. Hope that helps.
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If I have to take the carbs off once more...