The pivot 8 wherein said wedge includes {HEAD ~ a pair} of {TAIL ~ superposed wedges} bearing on each other through two facing flat faces inclined to the axis of said axial housing 
The pivot 8 wherein said wedge includes { HEAD ~ a pair } of { TAIL ~ superposed wedges } bearing on each other through two facing flat faces inclined to the axis of said axial housing
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH