Closing Surface from Points

Hey there! I’m modeling a lamp shade on grasshopper.
The surface from points is not closing entirely, how can I fix it?
I created rings and divided the curves into 20 points each. Then i did flip matrix and connected it to surface from points but it has a hole there, what’s your easiest solution?

Any reason why you’re using points when you could loft the circles, or revolve a profile?

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If you had posted a GH file, we could show you.

3. Attach minimal versions of all the relevant files