Cut a 2” circle of cardboard for a circle template. Lay the circle on the back side of the light swatch. Trim the swatch to about ½” to ¾” from the circle. It doesn’t need to be cut perfectly round but don’t cut it much smaller. A little larger gives you more to work with when you pull the thread.
Swatch with cardboard circle
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Baste a thread around the edge
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