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First, let me ask you a question then I'll do the research. What is the maximum radius you could have in the space you have for your helix. Remember the radius is to track center, so you have to add on at least an 1 or an 1 1/2 inches to the outside. So if the maximum radius you can have is 18 inches, then multiply that by 2 and you have 3 feet or 36 inches, then add on at least another three inches for construction etc. So you would need a space that could hold 39 inches round. And I haven't talked about seperation yet. So again, what is the maximum radius you could have?
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