Well looks like we have a winner! After disassembling the gearbox as I was sure something would show up, nothing! it was just as I built it, uni perfect, so then onto the torque tube and the coupling again perfect, but as I took the tube off, out rolled the center bearing. Have a look at the video of the clutch plate and the movement in the hub..?? Can they have some movement, I checked my other clutch plate and it's tight..
https://youtu.be/LI5aMebu1i0.