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