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