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