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This is the filler material
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Unwind it from the cartomizer slowly and carefully it will be a pain to find the start of it but I swear it is there someplace, just pick around for it.
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Unwind it completely
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Now you will get to a second inner material. This is a kind of cloth like material and it is a rectangular shape. You must pull on the thick black wire to pull it away from the cloth material, gently.
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Then remove the cloth material.