This is what I would do. Get one large bath towel and tie it in a simple knot. Place inside the empty drum and close the door.
Press the Spin Key, Soil Level Key and Power Key AT THE SAME TIME. All the lights come on and you are now in test mode.
Now we will go into Quick Spin Test Mode. Press the Delay Start and Silver Wash Keys together for 3 seconds to enter into the Quick Spin Test Mode. This test will last 2 minutes before it exits the Quick Spin Test Mode.
As this unit is ramping up speed, check the balance of the machine by pushing on the unit. From the front left corner, push towards the right rear corner and from the front right corner, push towards the left rear corner. If you can quiet the machine down from one of those 2 corners, adjust that leg down. Don't worry about the rear legs. You're only adjusting the front legs.