{HEAD ~ The rotor spindle} and controls pass through a central hole between {TAIL ~ the spar caps} 
{ HEAD ~ The rotor spindle } and controls pass through a central hole between { TAIL ~ the spar caps }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL