I went to the trouble of concrete fittings because when the swing it used, it might have a tendency to lift the back end of the dino off the ground.
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Lay out the footing locations to be at the center of dino legs.
The holes are about 18 inches deep -- about 12 inches of Sonotube was used in each hole as a form.
The metal straps embedded in the concrete will be used to bolt the legs in place.
This is a bit of work, but makes for a nice solid mount.
Gary September 5, 2009