Lathe Chucks for Yo-Yos

So, I am gonna have a machinist make me a design, but he said there’s no place for the chuck to hold so I have to make the rims about 5 milimeters wide.

What I’m confused is, how do large companies like YYF or MYY make their rims super thin? I don’t understand: Where do they hold the cylinder on the chuck?


Can you post a picture of the design?

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It’s basically an altered metal version of the yoyo me and Legyoyo made