This was my first attempt at using fusion 360, i went in blind and didn't research how to do things properly so this is very crude. At some point i will make a more finished model, and hopefully fix the problem with the overhang, i have also included the images that i used for reference while making this.

I have made a version of this with the same diameter as a trolley token in the UK, and added a hole so you can add it to a key chain.