I used a Harbor Freight heat gun on high and as the pvc get hot it flattens out and stretches. Make sure it is down all over the curve and let it cool before you pull it off the form. Remember what I said about making the cut in the center of the board? If I had, I would have had a male and a female pattern and just pulled the two together as the pvc was heated. I'd do that on the next batch.
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