On Tue, 12 Jul 2022 at 13:04, Peter Blodow <[email protected]> wrote:

 The pins, that's the point, consisted of
> a thin solid core with 3 or 4 tiny springy 'blades' surrounding it that
> made absolutely perfect contact.
>

 These sound very much like the "banana plugs" in the link in my first
message.
 https://uk.rs-online.com/web/p/banana-connectors/7632907

There are 1mm ones, but those appear to put the spring in the socket:
https://uk.rs-online.com/web/p/banana-connectors/3097546

But, as I said, one set of spring contacts might only contact one hole.
To be perfect for this application the springs would need to be W rather
than V shaped.
Or, so I think.

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is designed
for the especial use of mechanical geniuses, daredevils and lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1912

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