I have found two businesses that will repair my harmonic balancer. Both in California, where I'm at.
They are the Damperdudes @ 1-800-413-2673 located in Anderson, Calif and
Damper Doctors @1-530-246-2984 located in Redding, Calif.
I believe it was Damper Doctors that did mine as the name sounds familiar. Did a good job and the damper was all cleaned up like a new one when they sent it back after the rebuild.