What is it?  ?   ?  ?    This odd-looking contraption (code-name the Flux Capacitor)
is an early prototype of a light-weight U-Joint.  The four black hubs have bearings.
All four are bolted into the head of an aluminum bolt.  Two hubs are recessed into
holes drilled directly into the side of aluminum bolts.  The hubs fit snugly enough, but
two aluminum nuts tighten against the hubs to ensure they don't slip out.  Over-all,
this particular custom design provided good insights into multi-axis rotation, but hasn't
found a specific use yet. However, U-Joints are heavily used in R.Max.