CB Range discussion

It’s a bit strange that the ring I find most comfortable on my CB6000 (the one just bigger than medium) snapped last night. It was quite unfortunate since I had only recently told my wife about my chastity device and she seemed to accept it. She allowed me to keep it on overnight, but by morning the opening had split open. I don’t trust superglue much because it doesn’t hold up well under tension, so I switched over to the smaller ring. It pinched quite a bit even though I managed to get through the day in it. Now I’ve moved into the biggest ring available, but it feels a bit loose. Does anyone know of a UK-based supplier that sells individual rings? Or perhaps someone would be willing to swap with me?