Thank you Pilou!

It works great to divide the surface in 8 parts and sweep them separately. Didn't even think of that, I'm always afraid that there will be kinks between individual surfaces where they meet. But the way you've dividend it there's no risk for that. It would take some effort to adjust the curves so that the parts will meet in a nice way when you copy the whole thing.

Thanks again for showing me!

/Lars