The notch forms {TAIL ~ a finger portion} on the temple with the outside surface of the temple, and also creates a thinned wall section at the inner surface of the temple opposite {HEAD ~ the finger portion} 
The notch forms { TAIL ~ a finger portion } on the temple with the outside surface of the temple , and also creates a thinned wall section at the inner surface of the temple opposite { HEAD ~ the finger portion }
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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD