This is the best and clearest disassembly and reassembly video I could find when I did the full Cajun Gunworks Pro kit install in my Shadow 2.
Start watching from 4:15 for the removal and at 17:15 for the installation of both detents:
https://youtu.be/mOej5riXzOc
I've seen them all lol.. But yes I agree that is one of the best, in my eagerness of getting my gun cleaned up and ready for my match I guess didn't pay attention to that piece. Nowhere in Canada is that part available, I spoke with all the CZ shops and nothing. All are incoming but no ETA.