Well you can say what you want. I’ve refurbished more cone Sure Grips than there is days in a year. I bebeive believe what your pointing at is one of two metal plates that the springs set on. Not sure by the picture. The axle slides thru the side axle gear then thru the cone that does the locking in the rear. Unless your SG is damaged.
I believe your expertise but whatever it is it’s not letting it through . May be hard to see in pictures. It will be coming apart for a 3.91 gear and I’ll have the ring and pinion show inspect it. Thanks for your help