I do have a manual that has an explode diagram.

And the problem is the 'big' nut on the armature
inside the fly wheel hub.

I thought that even if you disassemble from the generator
end, how would one get to this hidden nut.

Are you saying that you do infact need to disassemble
from the generator end, leave the armature hanging,
then tap the nut off?

Is it really this stupid?

Appreciate your help.