This article is to show the procedures to check and solve the wobbling grinding stone on the Versaturn accessory. 

The main reason for the stone wobbling is due to the stone not rotating about its center of mass because of a non-concentric hole. Excess material 

can be removed by using a diamond dressing tool which can bring the center of mass inline with the axis of rotation. 

Image of diamond dressing tool

This tool can be purchased from amazon.

Here is a video showing how to use the diamond dressing tool: 

You should prepare a vacuum cleaner when going through the dressing procedure as it will cause a bit of a mess.