Spiral pipe on the surface which slide in certain angle

down side surface is normal because is perpendicular angle surface,
but what on top side surface is slide a bit for angle theta which the problem my spiral pipe going mess around this part,
anyhow to solve this thanks

unique.3dm (3.8 MB) unique.gh (20.7 KB)

Funny how the same topic appears in multiple threads, as if everyone is taking the same class?

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haha i am just starting to learn GH right on the basic way to understand … sorry …