The driving bevel gear is mounted on {TAIL ~ the lower end} of the transmission shaft and is mounted rotatably in {HEAD ~ the bearing seat}  
The driving bevel gear is mounted on { TAIL ~ the lower end } of the transmission shaft and is mounted rotatably in { HEAD ~ the bearing seat }
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH