Nice one ED.

I did a cap long ago in my other CAD program and just tried in MoI. I couldn't get MoI to fillet the inner edges of the folds nor add the final segments.

Here is my original (metal was too thick at the time): http://www.textualcreations.ca/Bottle%20Caps001.jpg

MoI unit is attached - I created one segment and radial copied 21 times.