A circular saw has a housing enclosing {HEAD ~ a motor} for driving {TAIL ~ an output shaft} about an axis of rotation 
A circular saw has a housing enclosing { HEAD ~ a motor } for driving { TAIL ~ an output shaft } about an axis of rotation
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH