Each turn assist {HEAD ~ cylinder} is coupled between the frame and {TAIL ~ a corresponding caster wheel assembly} 
is coupled between
Each turn assist { HEAD ~ cylinder } is coupled between the frame and { TAIL ~ a corresponding caster wheel assembly }
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL