Id go with shims, so much easier and you cant mess up! Id be worried about my yoyo like sticking together or something because i stink at stuff like that.
lol actually, you can mess up. I messed up, while screwing the yoyo, the shim slid out of the seat, so it was half in half out, then i screwed it in, so it crushed the shim, and be bearing was stuck ;D