Try this -
Take an end and fix it in place adjacent to the ornament. Take the WE and pass it through the shackle ring and back down to the ornament ring. Take the WE through the ornament ring and back up and again through the shackle ring. Take the WE back down and make a final loop adjacent to but not through the ornament ring and the WE back to the shackle.
You should now have two loops either end and five runs of cord between them.
Take the WE near the shackle and wind it around the bundle of five cords for four turns down towards the ornament loop. Finally pass the WE through the loop adjacent to the ornament loop and pull that loop tight by tensioning the appropriate shackle loop leg.
Balance up the loops and the structure, taking out any excess cord by drawing out the starting (fixed) end.
The loops translate forces to one another through the wraps making the loops secure. the starting 'fixed' line is bound but not secured, but to draw it out would need force to be applied to only its loop, But even then, the remaining shackle loop would still be secure.
Derek