One inch or inch-and-a-quarter closet dowel, or a fiberglass rod base, or an old antenna, or an old net handle w/ a dowel inserted. Don't use bamboo, it will shatter- You need calcutta for this application. Buy a gaff hook and drill a hole for the set tang, slightly smaller if it is a wooden handle. Hammer the tang in, or set it in a dab of adhesive (PL, Liquid Nails, 5200, epoxy, wood glue, etc.) If the material is machinable, make a small notch at the end to receive the hook where it bends out, to help it register. Wrap it w/ a light nylon or cotton line (Something the diameter of a bootlace is overkill), as you would wrap a rod guide.Soak it w/ varnish or polyurethane, or paint or stain. You just need something to set it in place. Epoxy will fail after exposure to the sun.
I've made dozens this way, for everything from dogs to tuna, and they see plenty of service, and never fail. And you don't need to worry about your line getting caught on a hose clamp.