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