After you get a new drive wheel, find something to use to shim it away from the wheel-the motor should tip away from the machine-when you're not using it. (I use the short end of a broken wooden spoon.) That will keep the flat spot from happening again, and wow, they happen fast! It doesn't need to be a big gap, just so long as the rubber end isn't touching the wheel.
eta: Don't ask me how many drive wheels it took before I learned to remember to do this!
Last edited by MrsBoats; 01-15-2012 at 05:23 AM.