The process 6, wherein {TAIL ~ the angle} of movement about {HEAD ~ the pivot} is about 60° 
The process 6 , wherein { TAIL ~ the angle } of movement about { HEAD ~ the pivot } is about 60 °
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH