I'm about to tear a Nagra III apart to replace a failed motor (broken commutator). I wonder if anyone here has attempted such a replacement, and would be interested to know how that turned out. I know that the Nagra III Service manual has dire warnings about disconnecting the motor shaft from the encoder wheel. No doubt Kudelski's ghost will haunt me, but I cannot see that this would be impossible. I will of course be replacing belts and clutch felts as well, but the motor encoder system is my current main concern.