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I once bought a product from a circle track supplier that was a round plastic (like 3/16" welding rod) that was to be "wicked" into a small pinhole after heating with a heat gun. Quick and worked well. The thin wall of the core will not normally accept the heat from any sort of torch. Maybe call a manufacturer and ask their recommendation too.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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