I knew there was a spacer there, I'm just saying that's probably not what's responsible for the change in sound from the original TB Plus. It's the coil separation.If the spacer were iron or steel, it would have a noticeable effect.
Ofcourse the coil separation plays the biggest role here, but eddy currents because of that aluminum thingie helps blurriness. I'm not sure if aluminum is worst comparing to iron or brass on this....