There is a part on the side of the carburetor that an arm that controls the butterlfy attaches to, and it swivels left/right and rests against the end of a screw attached to the throttle arm that controls the flow of fuel into the carb. It is circular and has a tail that curves up/down. How does this go onto the carb? I mean I know where it goes, but I dont know how it is supposed to be positioned. When I pulled it apart I didn't pay attention to how it was positioned. Thank you for any and all input.