you move the clip up to lean the mixture. You pull the spring up, there should be a white plastic sleeve that helps hold the cable end in. You pull the sleeve up, free the cable end from the side of the nut you're talking about. then you loosen the nut witha 6 pt. 8mm socket. that'll let the needle out. when you put it back in, put some anti-seize on it and don't tighten it much or you'll be sorry . the metal it's made of is weak, and it'll seize in the slide easy.