The drawer is designed to glide on two side rails.  Unfortuantely the drawer was not wide enough for the opening and would not stay on the side rails, so the drawer would fall down onto the shelf below.  I determined that the side rail needed to be beefed up a little bit so I removed the side rail and inserted a piece of wood (a wood paint stir stick) between the side of the cart and the side rail so that the drawer now rests securely on the side rails and glides in and out without falling down on the shelf below.  Otherwise, the cart size is perfect, the height is great for prep work and the overall quality (aside from the glitch with the drawer) is great.