This is a normal behavior for Sundia diabolos. There is a tiny gap between the axle and the hubs to allow the cups to spin independantly from the axle. This does not affect the performance and can be ignored.

Yes, single Evo cups in soft or hard are available on the site. Ordering a single diabolo cup for other models is only possible via mail for now. The price for a single cup is 14€. Although it is not yet available on the website, you can send an inquiry to info@diabolofocus.com

There is no warranty on the Sundia products. You are responsible of any damages after use. However, in the unlikely event your diabolo breaks shortly after a purchase, we will replace it free of charge.