Ensure that the hammer rotates freely still.

It may require some force, but shouldn't need much.

If the hammer won't rotate, loosen the motor mount bolts, retighten them, and recheck it.

Position the other bearing and tighten it down, still ensuring that it will rotate without much force.

Lock the eccentrics by pushing them towards the lip on the bearing and twisting it.

Tighten the set screw on the eccentrics.