{HEAD ~ The insert}, , and fin , are secured via {TAIL ~ grub screws}, , tightened by Allen key  
{ HEAD ~ The insert } , , and fin , are secured via { TAIL ~ grub screws } , , tightened by Allen key
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH