Getting a surface into cylindric form

Rhino
1

Hi iwant this kinda form to become zylindric or round.This means i want a tube and then afterwards distort it with the cage command

Screenshot (1)
Screenshot (1)1168×726 64.5 KB

2

any sketch of the result you re targetting ?

start with a _cylinder and _rebuild it with a desired about of CV s ?
no need for cage-Edit for a single surface.