Dear Linda, Glue will only hold so long. We have made this sort of
rubber cord necklace ourselves and it seems to work the best to run
a rivet through the metal and the rubber to create a mechanical hold
in addition to cementing it in place. I too have ordered the cords
ready made from Rio or Stuller, and am in the process now of going
through them and riveting them. Kind of a drag, but it is better
than unhappy customers.
Brenda
david lee jeweler
Golden Touch Jewelry
Mason City, Iowa