It's a 50cc in a 35cc plane with 85 flights on it. The prop has always been mounted parallel to the rod, which I just read in my AMA magazine is a no-no and causes vibration. So vibration is the cause. I do know how to balance a prop so that isn't the issue.

If I can get one out ok, then I'll take them all out. Otherwise, I do like the idea of just cutting them flush and installing new ones.