Oh no!!! I did as Hugo suggested (a couple of blobs of epoxy) to make the round knob turn the shaft (it wouldn't turn it even sitting on my desk inside, let alone in the car)

Unfortunately the push-to-select part of the knob didn't work after that, I may have put it back on too tight with the glue. I just tried to remove the knob from the shaft, or at least to loosen it up, and the display of the empeg has just gone dead :( :( :(

I highly recommend to anyone to leave this alone until empeg come up with a better solution than glue seeing how easy it is to blow the display trying to remove a glued knob (e.g. to change the display color). Trust me, a non-working knob is better than no display.

The unit still appears to work fine, plays music, remote seems to work, but no display at all. Gonna send an e-mail to Rob in a moment to find out how to get this fixed.

Hoping this is covered under warranty... given I was following an empeg suggested fix to a problem.