I call it the throttle linkage rod, you slacken the little 8mm nuts off and then turn the metal bit in the middle with the flats one way to lengthen it and one way to shorten it. Be careful not to overtighten the nuts as the plastic will be brittle and can easily crack, make sure you are using a guide on how to do a basic idle setting as you don't want to just mess around with it blind.
It's worth pooping the ball sockets off and putting a small bit of grease in them.
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