I want to try designing a yo-yo for someone to get experience and for the fun of it. I’ll design a yoyo to your specifications for you in CAD for free. If you wish to have a prototype, using your own money, you could go through FPM and get one. All I ask would be one of the prototypes. If you did not want to get a prototype made however, the CAD design would be free. PM me if you would like to take me up on the offer.
(If I get a large amount of requests I might not be able to respond as quickly as possible, so bear with me please.)