My yoyo loosens when I hit it.

Occasinally, when I play with my YYF Proton, I hit it so something and the gap loosens. If I don’t stop the yoyo, it splits. Is this normal? How do I fix this. (BTW I bought my Proton used and don’t know much about it).

Add a bit of Teflon tape to the axle.

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Yes, teflon tape or light duty loctite work fine. You can also tighten them a tad more. I’ve had a few that would spin apart on a hard throw as well until I gave them an extra twist (not too much though).

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Blue loc tite is what I use. works like a charm and cheap as can be!

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Thanks guys.