Tutorials

2 0 Beginner
Conical spring

1 0 Intermediate
If I understand your request correctly - you could just create your helix then project it onto your surface. Then reverse the helix and join with the one you just projected and check tangency.

0 1 Beginner
How to design my first cylinder. The method shown includes step by step easy ways with photos attached to help you understand better. This is completely basic and for the new one's in to 3D designing. If you have any questions or concerns let me know in the comments. Happy designing :D