Just to update this thread, I ordered a basic Dampener from Summit crossing my fingers it would be a press fit and not a bad crank. Didn't have time for a full install, but yesterday went out to the garage quickly and tried to slide it on the crank snout- it slides on by hand the first bit, but will require an install tool to get it the rest of the way.
Verdict is, its not the crank that is bad, thank goodness. Old damper is going into the scrap pile.
Thanks for all the input here. I'm glad I asked and didn't just slap it together.