Nikon 20MM F2.8 AF NIKKOR Lens "replacing rear mounting ring" Questions

...ring in the rear of your lens that is interchangable specifically so they can make one lens that fits every camera. The ring is called a T-mount ring. it should be held in place by at least 3 set ...

...replacing them as a SLR film camera buff with a really nice Nikon rig and Darkroom myself. That's about the extent of it, you've exhausted everything here for advice. Regards and good luck, Worldvet ...