On Wed, 9 Jan 2019, Fritz Mueller wrote:
So, one of the things I have along with my 11/45 is an RK05 alignment cartridge. Unfortunately, its seems warped -- rides up an down a few millimeters in each direction as you turn it in an RK05 drive. :-(
I don't think it's the platter but perhaps a dirty hub ring or centering cone. Try cleaning the ring and the cone of your disk pack.
Christian
