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