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