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