Yes, actually. I pressed the spacer into the 2mm groove you are speaking of. The shock sticks out of the tube with the spacer pressed in firmly. I don't understand how the description of my problem is vague. Shouldn't all 240z's have the same suspension set-up? The shock slides into the strut tube. Then you close it off with the gland nut. Compress the spring and secure the top hat with the provided bolt on top.
Now my problem; The gland nut will not close if I slide the shock in WITH the spacer. Without the spacer the shock slides in all the way, and although the gland nut now closes, I have too much play on the shock. From my understanding, the top of the shock should be almost flush to the tube so the gland nut would screw in and hold the shock in place.... Phew, am I missing something? I know I'm ignorant, but I know I'm not stupid.