I have a new in the box 74 vintage ST 46 Stunt.... however I originally purchased to fly R/C with and put a Perry Carb on it.. never installed the NVA.... and now I am missing the nut that threads on the spraybar (clamps the spraybar to the venturi)... anyone know where I can find this fine threaded nut??   besides this loose nut behind the handle   Thanks in advance for any information...

Chris