Corolla and hull function

Hello

I drew a corolla-shaped piece by making 3 circles of different sizes and then the boss/smoothed base function.

Then I selected a face to apply the shell function but it doesn't lead to the other end.

What is the solution?

I attach the SW 2013 file

diiity


duster.sldprt

Hello

You must also select the opposite side. The selection allows you to select the faces to be deleted.

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Thank you