Geberit bell repair

To avoid having to buy the entire Geberit bell, in case the fins on the partial part break, resulting in the small drain breaking, I created this ring to insert outside the pipe to prevent the piece from sliding back up. You can insert just the ring, as I did, but if you want to make it even more stable, I also drilled a hole for a pin. Obviously, it will be necessary to drill a corresponding small hole in the partial pipe as well.
I hope this is helpful.