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