Fabricating double helix and ruffles

The first stages of fabricating a double helix and fabricating a ruffled shape seems to be identical. In both you prepare a very tight coil. The difference lies in the way the coil is opened.
As I wrote in a previous post and as can be seen in the photo, I became pretty good in making the double helix, yet I just don’t get the process of creating ruffles (I'm not going to show photos of unsuccessful attempts).

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