76 cb360 carb screw, question, source

[tonuppirate]

looking for information about the small brass screw that sits about an inch above the pilot screw on the keihin carb. one of mine worked its way loose and fell out. bike bandit didn't have it, and i'm not really sure what it does. anyone know what it does, and where i might get one?
thanks
TP

 

[crazypj]

see reply in wanted
here's pic of carb with screw