A temple endpiece includes {TAIL ~ a set} of recesses that engage {HEAD ~ the projections} formed on the lens 
A temple endpiece includes { TAIL ~ a set } of recesses that engage { HEAD ~ the projections } formed on the lens
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH