Yup I remembered the tricks. I have to bring you up to Kens, great guy and hell you can spend days there looking around at just cool stuff.Also, the trick is the set up/centering of the drum or rotor. Get it wrong, you get an out of true product. I used to set em up and get close with the bit to see how far out the unit was. Then almost always, I would re chuck it again to be sure....