In an earlier contribution to this discussion,
Frank Erskine wrote:

I'm trying to find out whether the ¼" bush for a camera tripod is a
Whitworth or a UNC thread - both are 20 tpi, but of course the thread
form is different.
Any ideas please?

TIA -

I *think* it's Whitworth - but if you use UNC instead it ain't going to
matter too much!
--
Cheers,
Roger
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