{HEAD ~ The insert} & fins are held in place by use of grub screws which screw through the receptacle at an angle and apply {TAIL ~ pressure} to the insert and fin together 
{ HEAD ~ The insert } & fins are held in place by use of grub screws which screw through the receptacle at an angle and apply { TAIL ~ pressure } to the insert and fin together
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH