New moulds with hollow studs and inner stopper ring

[Rene Rechthaler]

Any progress here?

I would say to use the B or C as the new standard (most used, best compability)
the A version needs to get obsoleted (doesnt exist)
F is common in old sets (does anyone have a clue when the change was)
D, E and G are Exots (exist, but are rare)