Imperial gland - thread size?

[happysteve]

I need to replace this mess with a switch fuse (not the socket, obvs). The pyro is imperial; IR is low(ish) but above the minimum. Estimated age is about 60 years. The only things I'm missing are a banjo and a locking nut. I'm pretty sure I can get a 25mm banjo on to fit, but what thread were old imperial glands? Is it BSP, or something else? This is 1 inch. Where would I get one?

I couldn't see the code on the pot (probably round the back) but it looks like the size that's just shy of 10mm^2 equivalent.

Cheers!

 

[Mike Johnson]

Necessity being the mother of invention.