Carburetor compression spring

I am in the process of rebuilding my carb set for my 1997 VFR750. As I was ever so carefully taking them apart and putting parts from each carb in separate containers, somehow and someway the container for Carb #4 is missing the compression spring for the vacuum piston. Don't ask me how I lost it although I suspect it might have something to do with a kitten. It is listed as part #6050-MZ1-000 and is no longer available anywhere I've looked. Does anyone know where one of these can be sourced or if there is an alternate available?

Just after entering this post I looked under the table that I had looked under four times previous and, lo and behold, there sat the spring. Thank God for good glasses!

I am pretty sure that the kitten left it there while you were posting your message to VFRD