It was pretty easy to adjust with a 6mm socket wrench. It comes with the suction cup to remove the caps. They don’t slip too much unless they collide. One of the first ones I got was cracked on the part that holds the nuts, like it was over-tightened, which made it impossible (hard?) to adjust and it wouldn’t sleep, but I got another one since the second one worked fine. I think it’s a pretty nice feature. They’re kind of expensive for 2A yoyos but I like how they’re playing right right now. They’re still new to me so, I don’t know what problems they might have in the future like slipping, or durability.
2a players arm wrap by making the sleeping yoyo on their strong hand manipulate the string on the wrist on their weak hand. This leads to your strong hand having a different skill set than your weak hand. Making 2a at the highest level be fundamentally asynchronous.
Note in the video I am draping the string on either my weak wrist and strong wrist. Essentially had to relearn my 2a from the ground up switching the skillsets of both my hands to pull this off. (Secretly been doing that in training for past 8 years)