If a DaVinci is installed on a smooth floor and the lid is opened a lot, or left open for long periods of time, the weight of the lid will cause the counterbalance to want to lean forward. When this happens, the top section of the kiln slides forward and the bottom section slides backwards- slowly, over time. To counter this, the kiln needs to be anchored. You must bolt both the bottom of the counterbalance to the floor and the top of the counterbalance- where the safety chains hang- to the wall. If you just anchor one or the other, the kiln will still migrate over time.