Collapsed Steering Shaft

An assumption...

The double "D" shape of the upper and lower shafts "should" prevent one shaft from rotating without the other.

The upper part of the shaft should be held in by the retainers and bearings.

The lower part of the shaft should be held in by the lower cuppler. But that is what worried me as I have seen many that the top had come off.

I agree with what cudascott said. I recently got two shifter shafts for some test fitting and one was slighter shorter than the other. You could see the plastic shifted up the shaft and slightly shaved off.