Hello Peter: 

First of all, thanks for answering to my question.

Here you have a simplification of my model which is composed by an external part with two ball bearings inside it and a shaft through of those bearings.

There is a fix support in one of the shaft’s extreme and a force apply on the external part.

I don’t have identified yet which ball bearing I will be use.

Let me know if it is enough information or not.