Expanding on what johnstoeckel and Rever said - At the New Mexico Trout Conclave this past Feb., George Daniels recommended using a 3-inch Nite Ize Gear Tie
(https://www.rei.com/product/823491/n...3-package-of-4).

He would lay the dropper tag along the rod, and wrap a gear tie around the rod and dropper tag, snug up against the dropper fly.

Vinny