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