First and second arms are provided for connecting said {HEAD ~ ring top} to corresponding locations on said first and second arcuate elements adjacent to said {TAIL ~ opening} to allow said ring top to be displaced to expand and contract said ring shank while an overall round configuration is maintained 
First and second arms are provided for connecting said { HEAD ~ ring top } to corresponding locations on said first and second arcuate elements adjacent to said { TAIL ~ opening } to allow said ring top to be displaced to expand and contract said ring shank while an overall round configuration is maintained
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH 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 OTH OTH