You are right used as designed there would be no tension. I'm experimenting with a kuro koiler which for all intents and purposes is the same thing and tension is possible but still playing with it. I mentioned the video review so you could see it in action even though without a doubt it is not for Super X to put a short summary on it.
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Correct my man. Not for me
Way to much effort IMO to try to adapt it to tensioned application when there's things like the Artistic Wire Coil Gizmo already available, that will KILL this thing 7 ways till Sunday and cost less.