The key to this is that the bolts that attach the motor do not pass through the rubber. That is why rubber pads between the motor base and the motor mount did not work. The vibration was still being transferred through the bolts. I forwarded this info to the Grizzly Tech I had spoken to and he first apologized for the problem and then said he would pass the info on to the quality control department. Don't hold your breath but it is a step in the right direction. As for the remaining harmonic pattern, it would probably require the purchase of a new motor. For now, I am pleased with the results.