Sorry, I've only done the ugly mod and put the new pad directly on the cup. Yes, the stock pads are glued to the retainer ring; so reusing the ring with the new pads necessarily means removing the old pad from the ring, which I've not done but others have said that the old pad is destroyed in the process. In order to glue the new pad into the ring, the pad has to be trimmed slightly to clear the clips on the ring. So you have to destroy your old pad and probably void any sort of warranty on the new pad. I think somebody made a kind of tutorial a while ago, but I'm in my phone right now (and it's midnight) so I don't feel like trying to find it at the moment.