Backyard Discovery SKYFORT II SWING SET Owner's Manual & Assembly Instructions page 6

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The swing frame must not be installed directly on cement, asphalt, or any other hard surface.
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Your swing frame must be attached on a flat horizontal surface with a minimum of 2m between it and any
structure or obstacle such as a fence, garage house, tree branches, cloths lines, or electric cables.
For more information: http://www.lifespankids.com.au/natural-timber