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To begin, you need to route some circles out of some kind of stiff material. Plywood or particle board seems to be a good choice. They need to be the diameter you want the inside of your tube to be. If you need to be exact for some reason, you will have to take into account the thickness of the plastic you will be using to cover the disks to form the mold. Note the size of the center holes. These become improtant later on when you go to collapse the mold inside the tube for removal.


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