A mechanism for adjusting a distance between a first weight rack upright and a second weight rack upright. The mechanism includes bases that conform to a front face of the weight rack uprights. Horizontal pieces are coupled at a first end to the bases and are oriented at a first angle relative to the front face of the weight rack uprights. Bar hooks are coupled to a second end of the horizontal pieces. The bar hooks are oriented at a second angle relative to the horizontal pieces such that the bar hooks are substantially oriented in the first direction. The horizontal pieces are supported by one or more support pieces.