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Maybe think about the Protostar stuff, but in a card tube already (I'm doing this from memory so could be wrong.
Get the lightweight cardboard tube, with the flocking, and then slip a layer of C/F on it yourself. It can only make it stronger. If you think the card and CF is an overkill, peel off a layer or two of the cardboard, then apply the C/F.
Basically what I did for my 10", although not Protostar, but humble SonoTube.
Gary
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