Gueben – nah, the other side is the threaded side.
Kualla, nah, nothing stuck in there, that was my first instint too, but it’s just bare aluminium on the inside,
Jam bo – nah, makes no odds, the QR clamp is just to lock the QR in place on those maxles, it’s not actally doing anything to the thread, they just work with the thread tightening up. (I’ve used a 20mm maxle for years.)
tbh I reckon I could get it to work by drilling it out, but I’m not going to do that. I’ll just get a refund, buy something else. (One that comes with the axle this time, didn’t realise that at the time!)