Unroll srf Flow along srf

Scan-1-Cam-1 001.3dm (3.6 MB)
Hi All
I have a classic Unroll srf problem.Once I have sorted out the shape I want, how do I roll it back on to the cylinder?
I have tried Flowalongsrf but didn’t work. Tried splitting the cylinder. Also tried unroll UV.
Trying to get this cam made!
Thanks for your help.

I found the answer, thanks Pascal!