I’m sure it's been asked, and it’s hard to answer without seeing it. But this weekend I hit a stump I believe going very slow. Had a bad vibration when I gave it throttle so I backed it off and limped it back to dock loaded on trailer to find no visible sign of damage on prop. I had spare prop but it was late in the day so we went home. Next day I hooked up my fake a lake and spray nozzle for shaft bearing started boat and prop and shaft look fine. But I heard a knocking coming from bell housing at low RPM and stopped when raised. So I’m confident the damper plate is going. My question is would this be causing vibration? Or should I change prop take back to lake to see if vibration is gone? I’m going to change out damper plate but want to know if I should see if prop is out as well? Or could I possible have other issues?