Yohans gives a pretty in depth discussion of the proyo series here:
https://forums.yoyoexpert.com/t/tom-kuhn-heirloom-box-of-six-yo-yo-history/297724/12
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Yohans gives a pretty in depth discussion of the proyo series here:
https://forums.yoyoexpert.com/t/tom-kuhn-heirloom-box-of-six-yo-yo-history/297724/12