Wheels are fitted to an outer end of {HEAD ~ the piston rod} of {TAIL ~ the cylinder} to prop up the propped block 
of
Wheels are fitted to an outer end of { HEAD ~ the piston rod } of { TAIL ~ the cylinder } to prop up the propped block
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH