{HEAD ~ The temple endpiece} is rotated relative to the lens to set {TAIL ~ the pantoscopic angle} 
{ HEAD ~ The temple endpiece } is rotated relative to the lens to set { TAIL ~ the pantoscopic angle }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL