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