whats the first yoyo to use a size c bearing?

where else were such size c bearings used before yoyo?

and whats the first yoyo to use a 19mm slim pad?

Before the C bearing was popular people used to “beefcake” with 2 small bearings to double the gap width. I believe YoYoJam were the first to popularize the C bearing in the Dark Magic, Hitman etc with their o-ring response and twist-adjustable gap. Then it really took off when Frank Difeo started using the KonKave bearings in his yo-yos.

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^^^^Nice! It’s always good to learn a little bit of history.