The housing hub 68 and the primary flange 21 define a passage 70 which opens into a space 56 at the radially inner end of the primary flange and {HEAD ~ a chamber} 57 at {TAIL ~ the radially outer end} of the primary flange 
The housing hub 68 and the primary flange 21 define a passage 70 which opens into a space 56 at the radially inner end of the primary flange and { HEAD ~ a chamber } 57 at { TAIL ~ the radially outer end } of the primary flange
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH