How do you get hubstacks on an axiom like in this video.
Synergy caps fit and you can buy them here at yoyoexpert. I would not do anything though because there is a big chance that it will add a lot of vibe. The axiom is already a great yoyo anyway.
Synergy Caps. They are a bit fun, and when you’re tired of them you can just take them off.
they are like z-stacks i think.
I’ve never tried z-stacks… 
never liked using them imo…
~gorrilla_yo