Each flap can be pulled back from {TAIL ~ the base member} and then can be resecured once an instrument has been inserted between the flap and {HEAD ~ the base member} 
Each flap can be pulled back from { TAIL ~ the base member } and then can be resecured once an instrument has been inserted between the flap and { HEAD ~ the base member }
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD