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