Maybe more simple...
And advantage you can have start and target section different... here 2 circles but...

Make a boolean Diff between cylinder and plane

Ok. I learned very much (again). Thanks to you Michael and also for the smart way, Pilou!!! Now I can progress...fine.

Hi,
attached photo shows a method to get the twist direction you require. By creating a surface with desired twist.
Then array required section along curve aligned to surface and finally loft sections.
Cheers
Barry

Thank you!