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