Thanks, I just managed to fix the gag by getting an additional gag (of a completely different make), and using it's model to select the gag I couldn't see, remove it and then put it back on. I don't know how I managed to break it but hopefully it will remain functional now. Thanks again.
I've recently been using Dari's Haus Ball Gag v1.60 and for some reason after removing it and trying to put it back on it is now invisible and can't be clicked on. I'm still getting used to things so I don't know if this is a common issue (As I've also had this happen with a collar). I've tried deleting the item and getting a new one as well as restarting the game and using the regular viewer as well as the RL viewer but no luck. Any help anyone can give is greatly appreciated.