the second detent means being mounted for rotation in contact with one of either segment of {TAIL ~ the annular array} of teeth, whereby {HEAD ~ the number} of detent positions is determined according to which segment is contacted by the second detent means 
the second detent means being mounted for rotation in contact with one of either segment of { TAIL ~ the annular array } of teeth , whereby { HEAD ~ the number } of detent positions is determined according to which segment is contacted by the second detent means
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL 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