Complimentary cam surfaces 30 and 31 are on {HEAD ~ the flange} 27 of {TAIL ~ the update and lever arm} 29, respectively and circle about the rod 28 
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Complimentary cam surfaces 30 and 31 are on { HEAD ~ the flange } 27 of { TAIL ~ the update and lever arm } 29 , respectively and circle about the rod 28
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH