So I was using a duncan and took off the caps. Now It doesn’t want to be put together.
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In what way? You can’t get the caps back on or you unscrewed the halves and you can’t get them back together? Ya needs to be more specific, maybe a couple of pics would help… 
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Seconded! Knowing the model of the Yo-Yo from Duncan would also be useful. It would be good to include that when you attach pictures. I hope that we can help you out!