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