Kensington Expertmouse rubber ring replacement

This is a simple rubber band replacement for a Kensington expertmouse (K64325), because the surface of the rubber band deteriorates with age and loses grip.

With a carving knife, remove all of the rubber components, then drop in this print and add adhesive as required. It doesn't change other mechanics inside the trackball like [gregt](https://www.thingiverse.com/gregt/designs)'s.

The Openscad code for the print is here
[https://github.com/wwweagle/Kensington](https://github.com/wwweagle/Kensington)