The control member has control surfaces which are inclined at {TAIL ~ different angles} with respect to its axis, while the locking element has control surfaces which are complementary to the control surfaces of {HEAD ~ the control member} 
The control member has control surfaces which are inclined at { TAIL ~ different angles } with respect to its axis , while the locking element has control surfaces which are complementary to the control surfaces of { HEAD ~ the control member }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL 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 HEAD