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