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