The entrainment means 19 is thus secured to {TAIL ~ the cross plate} 20, which constitutes {HEAD ~ an oscillating member} 
The entrainment means 19 is thus secured to { TAIL ~ the cross plate } 20 , which constitutes { HEAD ~ an oscillating member }
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD