If you are OK with physical cuts on the inside of the yo-yo, this works REALLY well … shockingly well, and takes only a reasonble knife, it isn’t difficult to do. You basically end up with low-end wood starburst response:
I favor it for the wood yo-yos that aren’t reversible since you’re never gonna convert them from butterfly to imperial, etc. Or padoga lol.
But obviously it is permanent, turbo discs are not.