the thrust receiving flange is held by {HEAD ~ a locknut} screwed into an inner peripheral surface of the second housing through {TAIL ~ the second housing opening}, 
screwed through
the thrust receiving flange is held by { HEAD ~ a locknut } screwed into an inner peripheral surface of the second housing through { TAIL ~ the second housing opening } ,
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH