Use currogated cardboard. Cut it a hair less tall wide than the tuna can is all tall, across the grain. Roll the carboard into the can, insert a couple of wicks if you want, and pour over the parrafin. Let cool for an hour. It is best to do this on a heat insenstive surface with foil covering it.
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-IronRaven
When a man dare not speak without malice for fear of giving insult, that is when truth starts to die. Truth is the truest freedom.