As I was working on the carbs(put in a 4.5 pv, 68 jets and 34 squirters) I was trying to adjust the linkage on the center carb that looks like a vent and it broke. What is that? it goes from the top of the center carb over to the linkage and the throttle hits it when it is all the way forward to push a check valve down on the top of the bowl that vents out the side of the bowl. I have been looking all over online to get abother one and I can not find it anywhere