Originally Posted by vredstein

I had an A9 with what I think was an aluminum cups. They got indexed. I had a Stronglight O'Light threadless unit with the same roller bearing setup and it would never stay in adjustment. I've had better experience with Tange Levin units, replacing the caged bearings with loose balls.
Being open to the possibility the A9 problems were user error, it seems the Levin is more forgiving.