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