Brand New Drive Belts for Nagra 4 Series Recorders
Set of 3
The original last for a very long time but if they perish its hard to get proper fitting ones
These are made for soft compound rubber for maximum grip
One is situated above the motor, out of sight, used for rewind. (see pic.)

To fit all of these the motor has to be taken out.
Be very carefull if you want this done not to damage the tacho pickup or motor