[mactec54]

Maybe you have bad spindle MOTOR bearings? Take a look at how Tormach China balances their rotors... https://instagram.com/p/6YHUOkFUPC

The Chinese must of copied how most American motor manufactures balance their motors, they use the same method, the photos are of a major US manufacturer, most low speed motors are balanced this way, this could've been a little neater in the way your was done, so those bashing the way Chinese rotors are made, have not, ever seen a US made one, I have rebuilt hundreds & most balance them this way