The assembly can expediently be either a swiveling movement around an axis of {HEAD ~ rotation} or a translation movement in {TAIL ~ one direction} 
The assembly can expediently be either a swiveling movement around an axis of { HEAD ~ rotation } or a translation movement in { TAIL ~ one direction }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL