Rocking back and forth of {TAIL ~ the turnable member} acts through the clutch teeth and sprags to turn {HEAD ~ the intermediate member} 
Rocking back and forth of { TAIL ~ the turnable member } acts through the clutch teeth and sprags to turn { HEAD ~ the intermediate member }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD