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