Washer jet wing nut thread?

[Stevemorris]

Hi all,

Can't seem to find this anywhere,,,

The washer jet is loose in my car (65 FHC), in fact the wing nut isn't there....

I am going to search for it (wish me luck) but wanted to get a spare incase...

Does anyone know the thread size please?

Thanks,

Steve.

[Stevemorris]

Found the one I have is 5/16 UNF. A quick google search (not that I trust google) actually says the same? Anyway it's 5/16 UNF. I have read a lot of people fit plastic wing nuts, obviously to reduce the shake loose factor, anyone done the same?