Is there an old trick to turning a part exactly on center?
If this venue is not the right place, I would appreciate a pointer to an active group that could help me.

I have 12mm precision round shafting. I need to turn down one end of it to .25 inches diameter. I have a four jaw chuck, and center to within .001", but when I hard couple a stepper motor to this part, it binds due to the .25" boss not being exactly on center. I do have a spider coupling, but would rather go direct due to the added size of the coupling.

Is there some "trick" someone could enlighten me with?
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