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The easiest and laziest way (my kind of construction) is to use L brackets to connect your spiralling laminated plywood to the wooden uprights. People have used threaded rods, but you will be surprised at the expense. Unfortunately I lost a link to a web site that illustrated this type of construction. <br /> <br />I've been around, but not assisted the construction of three helix's. They can be complex; the "L" brackets idea is the easiest because you are working with two angles. With the L brackets you just hold them in place (or a tiny smidgeon of hot glue to hold them in place while you screw them in and your done.
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