Thank you so much Ian for taking all that trouble. Although it is difficult to see in the photograph, the G&L replacement is a slightly larger diameter than 2BA and so will not even start in the hole. This said, the TPI of both screws look to be about the same and the 2BA is indeed a rather loose fit in the hole so, maybe the threads in the hole have become corroded thus 'shrinking' it.
Having written off the G&L needle, thanks to your researches Ian I shall now look at it again because it sounds as though it should fit. I shall also research different threads to see if there is anything very close to 2BA for which I can buy a tap.
Regards and thank you again.
P.S. Interesting point too about Zenith using metric threads.
Having written off the G&L needle, thanks to your researches Ian I shall now look at it again because it sounds as though it should fit. I shall also research different threads to see if there is anything very close to 2BA for which I can buy a tap.
Regards and thank you again.
P.S. Interesting point too about Zenith using metric threads.