TurboSpinner

After publishing my MoneySpinner - http://www.thingiverse.com/thing:1937473 - I was searching for another way to provide a spinning mass that was small enough to stay within the dimensions of peoples' hands. I found a used bull nose ring from the days when we used to take cattle to agricultural shows.

The challenge here is to find a 'standard' size so that the STL files will fit in rings that are available globally. I have included to STLs, one that I know works with readily available Austral