Hello Jack and all,
Thanks for the positive comments Jack ,great to see all your brilliant research here too.

Yes I agree the G2 is like the first Brass nut Victa carby ,it had design flaws.( the brass nut carby coming loose on the mounting spigot)
The brass nut carby was usually upgraded to a later model carby just like the G2 was usually upgraded to the G3 carby.
I've seen old mower shops with 20 litre drums full of G2 carbies ,the serviceability of the G2 was no where near as good
as the G3 carby. The G3 was a big improvement over the G2.
I would think Victa had seen all the Briggs and Stratton air vane governors before they made the G2 and G3 carbies.
1925 Filed, Briggs and Stratton Patent.
Cheers
Max.