The thread 3/8 is the one that I found in the in de hole frame, if it was 26 tpi it must have been modified.
This was a first attempt to get closer to what was the original stud.
My mudguard stays are a mess... No original.... another part tu reproduce...
I think I should get tap and die in 26 CFI
There is a Thread list for al the bolt, stud and nuts for Ariel WNG?