For all the years I’ve made jewellery I have never ONCE seen one of these. A few years back one was used on an Aussie tv game show as a “what is it” item, but even then I had no idea.
So when I found one in a second hand shop for $1 I grabbed it!
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I’ve never heard of it either. Pretty nifty.
They are, and American apparently, so I’m surprised it’s taken me this long to see one.