Follow the step-by-step video demonstration above to tie your bracelets using a surgeon's knot, which creates one of the strongest and tightest knots possible when working with stretchy jewelry cords. Adding a dab of glue to the knot can add an extra layer of security. When pulling the knot tight, you'll want to be gentle so as not to overstretch the cord, which can weaken it and may lead to potential breakage.