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