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