How to add a motion constraint to a bearing?

I have made a bearing and I would like to add a motion constraint to the balls and housing. First I click on the "Constraint" button, then I choose "Rotation-Translation" motion type. The first selection is the inner side of the housing, and the second selection would be the ball, but I can not select the ball.
Is there a way to make it work?

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1 Answer

At Dynamic Simulation add 3D contact joint. Make sure You have enough degrees of freedom with ball.

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