Marc,
If you balance a prop, then move it on the spindle and it's out, then that probably means that the spindle is bent.

It happened to me. I Made another spindle for the magnetic balance from landing gear wire. Ground the ends pointy on my bench grinder.

Roll your spindle (without the cone thingies) on a piece of plate glass, and see if you hear a click with every rotation. If so, toss it.