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