I was about to agrew with Studio.
Also, are you tightening it hard?
Try unscrewing a little and see if it works.
Also, it sounds like the solid spin (bearing sits on) might be damaged so the bearing is a tight fit.
But hmm, even it the center is tight the rest can spin…
Does the bearing spin inside the yoyo when apart? (Set the bearing the the yoyo and flick it)
Its eaither damage to the seat, dirt or something in the seat causing it not to spin. Or damage/dirt/junk on the Solid Spin.
Take a que-tip,or something fluffy on a stick/piece…
Dip the end/fluffy part in some Rubbing Alcohol, or something related to that in forms of cleaning alcohol.
Then rub it in the bearing seat and on the metal part and thoroughly clean it.
I have a feeling the problem is this.
The solid spin has been someone pushed out just enough so that the bearing basically sits on the floor of the seat. Causing no spin.
This happened on my C3 Halo. The, ahh whats it called, the side effect sorta thingy… Forgot :-\
But, they got pushed out and the bearing say on the bearing seat floor and didn’t spin.
But yes a picture can help.
Take the caps out with a suction cup, or poke a tiny hole with a pin in the cap. And with the suction cup, suction the cap and pull, with the pin stick it in the hole you made as far as possible and pry it out. (Any small needle/tack)
Take both caps out and look at the solid spin. It it flush with the plastic or is it pushed out?
If its pushed out, you can-
Try with your hands to push it back in-
Get something like a-- lets use a pencil for example, but you need something stronger…
T For example<. The I part is the metal stick or for the example a Pencil.
The top of the T is the yoyo. Push on the yoyo and it should go in…
If not contact yoyoexpert and they can use their Press to push it back in…
Good luck :-\