Replacement Monometer for FX Streamline?

[Kid Shelleen]

I need to replace a broken monometer for my FX Streamline but FX USA still doesn't have any in stock.  Does anyone know if there is another monometer with the correct thread size, that will work?  Perhaps an Air Venturi, Benjamin Marauder, Seneca for a Sumatra or Recluse, or even one from McMaster Carr.  Hard to believe that the only FX supplier in the US doesn't have this part available.

Thanks for the help.  Shelleen