Installing the base. It's best to drill out the screw holes in the base to a diameter slightly larger than the screw, so the thread engages only the cabinet bottom and fits loosely in the base itself. Important note: The center of gravity for these enclosures is NOT at the front-back center of the enclosure; it's much closer to the front. It's hard to tell from this picture, but the back of the base is only 1/2" behind the back of the enclosure. For proper balance the front of the base should extend 4" or more out from the front of the enclosure.