" That design allows the spring to spin independent of the strut mount which is important for two reasons. First, when turning the front wheels this is necessary to prevent binding of the spring in a MacPhereson strut front suspension. Second, when the spring is compressed, it will naturally wants to unwind slightly which causes the top of the spring to rotate relative to the bottom, so the design above allows this to happen resulting in a smoother feeling suspension.
I have never held the Fortune Auto camber plates in my hands, but it appears from the pictures I've seen that the thrust loads from the weight of the car are transferred through the spring perch and into the spherical bearing. This is what I am talking about preventing.
Here you have to torrington bearing installed between the spring perch and the spring. In the image posted in the thread above, the bearing is installed between the spring perch and the mount. Either way it allows for rotation of the spring, but still transfers the thrust loads to the spherical bearing.
If you can envision a version of the mount above where the green spring perch directly contacts the black slide and in between the is torrington bearing, that would be what I am talking about. The thrust loads would be transferred directly to the mount, and the spherical bearing would position the strut shaft. "