{HEAD ~ a limiting element} for limiting rotational displacements of the second coupling element with respect to {TAIL ~ the first coupling element}; and 
{ HEAD ~ a limiting element } for limiting rotational displacements of the second coupling element with respect to { TAIL ~ the first coupling element } ; and
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH