How to move an Ball on an surface

Hey, I have an Problem in an Big Assebly. I want to let the ball move along the Surface like it does in real. But all I was able to do was to connect the ball tangential to one surface but not the the compleate surface.

I have made an simple Assebly with an Sketch how the Ball should move along.

In the Rarfile are the 3 Parts and one Assebly as Solidwork 2014 Files and Step Files.

I hope I have explained it well.

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