Here is what I have been doing on the last few WHings. I noticed that on some whith triangles, if they aren't big enough they have a tendency to drupe in the center. So I came up with and idea of a sleeve with a cut out so it can be hung with one pin or picture hanger.
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Another idea is to use one or more of those curtain hangers that have a gripper, like a cloths pin on the end.
peace