{HEAD ~ A casing} is mounted to two respective outer peripheries of the two end caps and accommodates {TAIL ~ the axle} therein 
accommodates
{ HEAD ~ A casing } is mounted to two respective outer peripheries of the two end caps and accommodates { TAIL ~ the axle } therein
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH