Nothing further yet.
It was a huge disappointment when I spent $$ on an Briggs & Stratton OEM diaphragm and gasket kit, only to find it was as thin as the aftermarket ones I have.
The "loan" carburetor is currently still on there.
It is now going for winter and the mower has been stowed for the moment.
I also saw that on Alibaba one can buy a new carburetor for little money. Also a tank.
Not sure what I will do next.
Best regards
Bernt