Johnroy I have a 4X4 and I'll post pictures of the linkage on my unit for you later today or tomorrow.
The index rod does need to be straight. It attaches to the powder drop using the linkage and is supposed to auto index the shell plate. The problem is there is a small plastic bushing that is supposed to turn that index rod, and the bushing wears out very quickly. I just index the plate myself, it is much more dependable than the bushing. The rod is covered by the lifetime warranty.
The shell plate is a pain to adjust to the point it holds the case securely enough yet still turns freely but it does do it, you just have to find that happy spot by adjusting tension a little at a time. I'll post some pics of that also.