Why don’t my new U joints fit? (Solved, thanks!)

Righty Tighty said

I was worried if I squeezed the caps together too much that the joint would be too tight.

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I typically press them in and once the clips are on take it out of the vice and give each cap a gentle rap with a hammer, one side and then the other. I don't know if it helps but that what I do, lol. It does seem to make the joint float a little better.