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Bob; <br /> <br />Not yet Bob. Since one goes up and one down in the double helix described, the grades wont match and the offset would allow you (hopefully) to use the same rod to support both the inside and outside helix. An oval helix may also make it easier to cross at grade at top and bottom without having to extend the inside above or below the outside helix. ( Too long a day to think this hard in 3D). Anyway, I cheat now and use the kit on the market for my helix.
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