Hi Gunter,

> Incidentally I found this tutorial on youtube by Andrei Samardac and am
> currently trying to figure out how he did it...

That one was done by using "Rail revolve" instead of the regular revolve. Rail revolve takes a path curve in addition to the profile, and it has the particular property that the surface generated will inherit the same control point structures as those input curves without doing any modification on them.

Note that around 0:34 when he does the revolve, that the command that is active is the "Rail revolve" command on the right here, not the default plain Revolve one on the left:



- Michael