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Re: Bumper Thickness
R29 A. "be backed by 3⁄4 in. (nominal) thick (~19mm) by 5 in. ± 1⁄2 in. (~127 mm ± 12 mm) tall plywood or solid, robust wood."
R29 C. "use a stacked pair of approximately 21⁄2 in. (nominal) round, petal, or hex “pool noodles” (solid or hollow) as the BUMPER cushion material"
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