From recent research and info from MB Dealer, on some models, the vibration damper was fitted to front section of prop together with flexdisk, and subsequently balanced as a complete unit.
Later production doesn't have this damper at all.
If you discarded the damper, you'd possibly need to have the whole prop rebalanced?

I'm presently rebuilding a C220 prop, see thread "centering bush removal " on this board. Please send Personal Message, if you'd like to chat on this topic.
ATB
Simon

__________________
W202-C220D ( UK ) 310K miles