Are you trying to encase a copper or brass tube? There is another thread on this somewhere. Sorry I don't have time to look but I remember to...
Pick fairly thin tube, slip it on your mandrel, it must be snug, then you get it red hot and then add white hot glass to it while it is still red hot, you then add a little extra to make the ends smooth to hide the sharpness of the metal. Hope this helps!
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