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For what it's worth I have seen similar setups made of old tires that had been unitized as a stack. While I have no direct experience with them I would imagine them to be more durable than foam lined tubes.
Also there's more there to fuel a fire...
Ek
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Personally, I'm interested in keeping other people from building Utopia, because the more you believe you can create heaven on earth the more likely you are to set up guillotines in the public square to hasten the process. -- James Lileks
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