Gio,
Thaks for the link and the pictures, I am still on the dark have no idea of how is done, as you know is a very expensive movement and do not want to ruin it.
I will try to PM The Zigmeister, he is always busy so I am not sure if he'll be able to help me
Now that I think about well, judging for those picture I am not sure that you will have to remove any parts in order to pull the stem out of the movement, it just does not make sense.
None of the other movements I have seen Asian or Swiss is necessary to do that.
I may be wrong anyway