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You can't really DIY the super nova, cut some angles into a softball? No.
You can kind of glue two lax balls together to make the gemini, but not quite the same hardness, and multitaskability.
I think the price point of this threw me for a loop. I realize the materials cost way more than the other two since there's bearings etc. This seems like a bunch of roller hockey skate wheels on a stick. But, then, I looked up the cost to DIY this, and damn roller hockey wheels are expensive. Think I'll be picking this up.