Well the shell function seems to be a bit limited actually, as I understand it's a complex operation in fact.
I would love to have a look to a more advanced cad software that can handle complex shelling, but
I'm not sure which one I have to try. (need a demo version :))
For your example you will have a better result by sweeping the same curve with 2 circles having 2 different diameters, and then
do a subtractive boolean .
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