Any know how to mod a YYF One

Modding a One is just like modding any other yo-yo. What are you wanting it to do that it doesn’t already do?

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Not necessarily a modification, but on my 2011 ONE seemed to be able to accept hubstacks. I stacked my one and it played great(if you don’t mind a bit of vibe).

Another thing you might be able to do is lathe down the string gap a tiny bit make it a tad bit wider.

how did you put hubcaps on it?

I took the hubstacks and axle from my YYF Grind Machine and simply replaced the stock bolt and nut in the ONE with the hubstack assembly. This requires you to remove the ONE’s sidecaps, though.

i have all of those, minus the stacks themself