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