These pins are positioned 90° apart on an imaginary plane through {TAIL ~ the equator} of {HEAD ~ the inner core} 
These pins are positioned 90 ° apart on an imaginary plane through { TAIL ~ the equator } of { HEAD ~ the inner core }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD