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one thing you could do, and I don't what size pipe your using, but say 4 ". You could make the cast using the inside if a 6" pipe for the bottom of the cast (Outside of the coils) then add 4 inch to the top (Inside of coils).
That might aid in the casting.
But I am pretty sure no matter what you do your most likely would need a means to balance the thing after you build it. Like an old bubble balancer. Most every kind of machine rotor, drum, shaft has to be balance after its built. Unless its very stable and solid material its bound to have inconsistancy in the material.
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