Originally Posted by PatriceJ
look for a board that has four-point contact with the floor instead of the two bars shown in the picture.
the wider apart the pairs of points are, the more stable the board will be.
And with the 4 point system, if it still wants to wobble, I've put a "shim" (my shim is a rubber slipper) under one foot and it becomes very steady. Like she said: wider feet:more stable.