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I had originally planned to only use OSB/Plywood as my base on my 8x8 layout (soon adding on 17x10 addition)... But found that in 8x8 I couldn't get enough run to accomodate the rise I wanted w/o building a helix... So I put on a sheet of 2' thick foam over the plywood and then I could use the bridge I wanted to use, by cutting away the foam...
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