Because you said it, it is universal truth? , I dont think so, It is not my own truth, we all do and you know it too...it is a common sense truth, it is a fact, M2 is the predecessor of all til MA.
What you mean articulated winding? can you elaborate?
M2 is not a red-haired step child, which journal did you find these? need facts.
No M3 is a different beast but not the same as M2 successors. Mechanically M2 til MA has the same mechanism. Did you teardown an M? , I do.
I did franken-style it too myself with nikon F slr titanium focal shutter too.
Moogie specified this too, there is not much the different after M2.
Theyd just made it do cost cutting like M4 til Midland and to M6. Lol!