A close-up of the Mini-Hub without the metal jacket.  This is about as simple a spinning hub I can think
of, with all extraneous parts removed.  All that's left is the bearings, nuts, and head-less bolt.  In fact the
bolt is partly hollowed for allen-wrench access.  I made a simple copper sleeve to keep both bearings
separated.  This bearing is next to a penny to show how small it is.  I think this design will find many
uses in Robot Maxamillian.