If you smacked it in places other than the center lug you may have damaged the rubber dampner. Another thing to keep in mind when installing the harmonic dampner is belt alignment. While it probably won't make the noise you hear, a mis-aligned belt will wear quickly and may come off while the engine is running. You need to use a straight edge when installing the balancer to make sure the alignement is correct.

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.