Suspension with Configurable joint?

Hi everyone.

I'm trying to achieve something like this:

The sphere rotation like this in the video is not important for me. For me the important thing is, that the four spheres are moving up and down like a car suspension.

I read this thread here:
https://forum.unity.com/threads/suspension-with-configurablejoint.38333/

I can't make this. I don't know why? Why is that not working. I'm sitting here 2 days without success.



All 4 spheres has rigid body and configurable joint attached.

Thanks for any help.

 

Have you solved?