After butchering my fenders by rolling them, I came to the conclusion that I may as well lower my car. The front, being a normal coilover type are simple. The rears, however, are more complicated. I know how to adjust the strut height, but in conjunction with the strut I also have to adjust the spring. I cannot get the spring to adjust. I got the lock collar up a little, but no matter how much load I take off of the spring, it simply won't adjust. Do I have to drop the spring cup to adjust it? That would seem like a silly way to adjust the height of such a high end component. The upper one is the locking collar and the lower is the adjustment. Correct? Any help is appreciated.

 

Update. Tried to work on the front today. Cannot shorten them either. Do I have to remove the bolt that holds the coilover onto the lower control arm, or should the entire threaded body screw into/out of the bottom mount? Seems highly unfitting of this product to have to remove the lower bolt just to adjust height. Again, any advice is appreciated.

Pic of Fronts (Photo Cred : Doh-Joe on my350z.com)