Again the spiral problem

Hello, now I am already sitting two days on this problem and do not know how to fix it.

On YouTube there is a video of a guy who makes a spine in form of a cone :

When i try to do the same it doesn’t work, or only in one part, i tried every possibility but can’t figure out what i am doing wrong. Here the video:

Maybe somebody can help

Hey @AST, to make a conical spring, I suggest another way of doing it:

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I demonstrated several ways to do that sort of thing here a while back:

I hope that helps.