Hi I was wondering if anyone knows how to do bearing fixtures. I have a shaft that has collars on it that are fitted to bearings. The bigger collar to the left of the image is attached to a thrust bearing while the smaller collar on the right is attached to a regular bearing. I'm applying equal and opposite torques on each end of the shaft and also forces to the entire shaft itself. My problem is that I can't figure out a way to fix the shaft so that the collars(where the bearings are applied) have supports that prevent the shaft from translating laterally but still allows for the twisting of the entire shaft and collars.

As the torque is applied, I expect the shaft and collars to elongate axially and shrink in diameter due to the Poisson effect. Also there cannot be bending of the collars due to the bearings not being self-aligning. Also, I have calculated the applied reactions on the collar due to the bearings if that is helpful. Would anyone know how to do this?