a pivot support having {TAIL ~ a pivot} axis longitudinally oriented with {HEAD ~ respect} to the frame 
a pivot support having { TAIL ~ a pivot } axis longitudinally oriented with { HEAD ~ respect } to the frame
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH