The axle unit 20 is located within {HEAD ~ the two flanges} 13 and {TAIL ~ the hollow tube} 14 
The axle unit 20 is located within { HEAD ~ the two flanges } 13 and { TAIL ~ the hollow tube } 14
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH