Close hole after using screw modifier I am trying to create a specific kind of look on a mesh, as to be seen on the following picture: 

https://www.bz-berlin.de/data/uploads/multimedia/archive/00375/Merida2_375848a-724x432.jpg

Doesn't have to be 100% accurate, since it won't be too close in the final render, but I still want that swirl effect at the end parts of the bow.

In the picture you can see my attempt to screw two vertices, connected via an edge, to create a similar effect, but whatever I do I end up with a distorted spiral, or with a big hole in the middle. Any idea how I can close this hole? Or maybe a smarter way to get by?

Thanks already! :)
You could do it with a circle or with Grid Fill, but it really depends on your goal, what are you supposed to do with this spiral?