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yes, the rubber should be visible, at least where it is injected in between the hub and weight ring. I believe the hub material is gray cast iron so it is brittle, even more so on the key way as that is a huge stress riser. Most are cut with a key way broach that has sharp corners.

The harmonic damper isn't there to correct imbalance, although many have this provision. The purpose is to damp crankshaft torsional vibrations. Diesels need this far more than gasoline engines due to higher compression ratios and sharper ignition conditions (diesel clatter). prolonged idling...