{TAIL ~ The eccentrics} and cranks associated with each piston and {HEAD ~ cylinder} maintain their parallel relationship while they are rotating 
{ TAIL ~ The eccentrics } and cranks associated with each piston and { HEAD ~ cylinder } maintain their parallel relationship while they are rotating
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH