Hello
PaulI guess the explanation is something like that.
It does look like a Villiers design ...
In this detail from a Victa engine brochure (from a later date)
the detail shows the known brass nut arrangement. The illustrations
look to be from the same artist.
My best guess is that the newsprint ad had a mock-up for
the artist to work with. I say that because the printad makes
specific reference to the carby being:
"VICTA single lever dustproof carburettor," and that the engine
was, "Wholly designed and manufactured in Australia by Australians..."
Well, we know that didn't include, at that time, recognised
ancillaries like magnetos. If the carby was designed here, it appears
to have been rushed - without sufficient testing.
Perhaps this is indicative of the tight schedule Victa placed
itself under - wanting to release their
Model 1 out-of-season.
I hope it is fair to say that Victa moved from a proven design
to a brass-nut-and-flange system that has proved to be a poor design.
The rest is history.----------------------------
Jack