My SuperNova chuck runs true on an old Delta lathe (1"x8tpi), but when a new adapter is used on a new Powermatic (1 1/4"x8tpi) the chuck wobbles. A new Talon has no problem on the Powermatic, nor does the faceplate sent with the lathe.
A second new insert from Teknatool did not fix the problem. When just the insert is screwed to the arbor and the setscrew secured, it will not run true.
Rick Smith posted a similar problem in 2007 on a Delta 1440, but my chuck runs true on one lathe, but not the other.