the damage you see was caused when i removed it using a srewdriver. was very hard to do, as i mentioned in previous post.
i guess the all problem started when i couldn't slide the linkage over the plastic tread.
i guess i should have given it another try, and use more patience.(or use a press drill, that i didn't have back then)
i do not exclude, me doing something wrong. especially when you say you didn't have an issue. i guess the story was over for me, when i removed the plastic tread.
i assumed since its plastic, it needs to be removed, and the linkage will fit on the diameter of the metal part. i can see how you can adjust it if you do not have an issue sliding the linkage, and secure it with the Allen screws. that wasn't my case unfortunately.
still i think the Allen is bad solution. it would have been perfect if the linkage had a matching tread, and a secure nut.
but that is fine, i lost 40$, but learned a valuable lesson.
the SS was my second project on the car, and i guess i was to "rusty" and to exited to complete. today, i take my time and plan 10 steps ahead

sure happy that you got yours right
i got it more then a year ago, directly from Vertex Auto (drove there).