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Draggable area for rotation?

I have a circular object which I'm using as a kind of selector wheel (similar to https://support.proto.io/hc/en-us/articles/220872327-Draggable-Rotate ). While this works just fine, the "active area" for dragging is not simply the circle, but actually the square that encloses it.

In the example linked above, this is not much of a problem, however I am actually working with multiple concentric selector wheels of differing diameters, so sometimes the four courners of an inner wheel overlap parts of an outer wheel, making adjustment frustrating.

Can anyone think of a workaround? I've tried both regular objects and containers, and even parenting an oval shape on to the underlying rotating shape, all to no avail. Thanks in advance for any suggestions!

 

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