Description by gardenville
DAM ver 2 top end view. If you look you can see the 2nd poly Tube from each edge is connected to the valley between the 1st and 2nd Poly Tube from each edge. The shiny looking area is the Poly Tube.
The top will have a short sleeve sewn into it that the Poly Tube will slide through connecting it to the bottom of the DAM. If you think of this Poly Tube as a hinge pin you get the idea.
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