This comment by @JTizzle brings up something I’ve thought about. With side effects we can only add or remove mass at the axle (mass that doesn’t affect the rotational inertia), so it doesn’t make sense for yoyos with SEs to be designed with very much center weight. A rim weighted yoyo can be customised to have a lot of center weight as well, which will have a large effect on feel, but a center weighted yoyo will only be able to become an extremely center weighted yoyo.
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