a ribbon burner would come in handy here. I have a neon ribbon burner that works great for this. You heat up a section of it at a time. Usually one loop of the coil at a time. and make it as long as you like. Using a "mandrel" on this type of work just doesn't work, unless you have a lath.
try drawing the dia. on a graphite plate or better yet some refractory paper. heat up small sections of tubing at a time and lay it down on the drawing to guide you. the flat surface will also help in keeping the glass from drooping while you do it.
Let us know how it comes out.
Mike
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