The switches 58 and 59 cause {HEAD ~ the motor} 43 to rotate in {TAIL ~ opposite directions} 
to rotate in
The switches 58 and 59 cause { HEAD ~ the motor } 43 to rotate in { TAIL ~ opposite directions }
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL