Im having trouble on thumb grind. can u guys help. maybe some vids.
I dont have a vid, but something that helped me was to throw the yoyo at a slant, have the top part pointing at, idk, the very top of your head
Also, if your just learning, go into trapeze then just stick your thumb in. But the thing that really helped me was the slant. try it, it helped me ;D
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Yeah, that slant really helps. 
Here ya go!
try tilting the yoyo back towards yourself