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