First I took a square of heavy interfacing and a square of black bottom weight fabric. I lined them up under the holes and sewed a couple circles.
Then I trimmed the excess fabric and cut a smaller circle in the center.
Back to my sewing machine, I stitched from the center hole towards the outsides like a sun around the hole a few times.
Finally I threaded the straps through the hole. It's a much tighter fit. Hopefully they will last all year!