The sand in the tube helps prevent it from "kinking" and bending smoothly, as you say just "flattening could be a positive if you could get it to do just that and not kink.
I'm sure all of us DIY'ers have experienced the "I'd do it different if I ever did it again" but I applaud the first attempt of all of us and the sharing of that effort, for it is from those that the rest of us can benefit in our projects by building on.
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