That's exactly what I thought when I saw your idea. In fact, washers were my first choice and I was intending to crochet around them or something. Yo-yos would be prettier, and fun!
Here's my final weights. I took the hangers out, trimmed the rough plastic and then just dipped that half in to cover the hanger marks.
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Originally Posted by
Aurora
You could always use two washers, if you want them heavier. They stay put because they have the large flat surface area -- and, they were fun and easy to make.