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