What is the substance used to wrap the coil and keep it away from the filler? I think people call it a diaper lol. And were can one purchase said substance? I really like my vision stone, but don't really like the idea of inhaling the dust from the silica wick I have. My throat was starting to get a touch irritated from it so I switched to cartos. I tried a natural fiber wick...which worked pretty good..but blegh...nasty undertaste. So I set there thinking, if I can get the stuff they wrap carto coils in, wrap that around my natural fiber, and then wrap the coil around that...I can use my stone!