3yo3 ceephax prototype bad wobble please help

Hi I have a 3yo3 ceephax prototype with a extremely bad wobble and I have no idea how to fix it I have tried replacing the axle and that didn’t work, I put some big o rings in the sides and that took the wobble down but it didn’t go down a lot. I don’t know what else it could be the yoyo looks like its in pretty good condition. What else do you think it could be and how do you think I could fix it? ???