I've got three different ones, now.
One is a basically a bodkin style holder with the wire bent into sort of a Y shape, two loops on the end. It was cheap. It sucks. I never, never use it.
Then, I replaced it with a model featuring a big brass base, and two very fine wire hooks that come up and criss-cross over. You thread the loop through, then spin. The wires are very thin, very springy and will close up. Meh. Spending money with one that's got a
handle and the base on a bearing would've been better. But, I still would've bought the third style...
Finally, I've got the one that I watched Gary Border use. Its the same heavy brass base, but with a single stout hook. Slip into the loop, and let it hang. Use the fingers to hold the loop open, insert material, then close it and clamp between fingertips. Spin the base. Spin it more. One more time, then release your clamped fingers and it instantly spins up the loop tight.