I designed this holder for a bicycle or a stroller to attach/hold a pinwheel. The holder can be fixed with a couple of rubber bands & pinwheel could be inserted right at the top. 

The attachment idea was inspired by this pinwheel model page [https://makerworld.com/en/models/1915771-pinwheel-a-breeze-of-joy?from=search#profileId-2055064](https://makerworld.com/en/models/1915771-pinwheel-a-breeze-of-joy?from=search#profileId-2055064)