Have a look here Baz
Juneero (circuitousroot.com) – and quoting from there:
"The supplied die was 6BA and the standard thread was also 6BA. The 1941 reviewer in Model Engineer { ME 2070} gives the rod diameter as 1/8 inch. But Kevin Steele gives the rod diameter as 0.104 inch (from his research, I believe, not from examination of materials). A quick search online indicates that a 6BA thread has a diameter over the thread of 0.11 inches, which splits this difference. The strip width was 3/8 inch, and the angle width was 3/8 by 3/8 inch. Strip thickness was 0.028 inch, in soft mild steel (or one could use aluminum)"
I have a Junero tool myself by the way – but none of the original material – which was sold in 1/- packets (for folk who still remember how much that was!)
Some more information here: Juneero – The Brighton Toy and Model Index (brightontoymuseum.co.uk)
Apart from the ME stuff, there were also two short articles in Practical Mechanics (1940) – that I have if you are interested.
Regards,
IanT
Edited By IanT on 01/02/2023 23:07:00