If you are going to externally balance, there should be a weight in the box with the damper. Use that weight. But never put the damper on the crank to balance.
I'll confess.... I am not getting the reason for this. How can one externally balance without the imbalanced weight (actually, the 'moment') being properly placed at each end? Is this simulated or 'computed out', somehow for some machines?
I've looked at several videos and this one shows the damper and flywheel installed in the crank balance process:
