The center opening 48 extends into and allows {TAIL ~ access} to a center cavity 52 in {HEAD ~ the center portion} 46 
The center opening 48 extends into and allows { TAIL ~ access } to a center cavity 52 in { HEAD ~ the center portion } 46
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH