A sliding mechanism includes a first part and a second part adapted for sliding translation within the first part. A bracket attached to the first part includes a bracket guide rib structure for constraining a lateral motion of the second part, including a rib defining an unbroken interface surface for the second part. The bracket guide rib structure may include a continuous rib member defining a continuous a continuous planar slider interface surface, a sinusoidal wave pattern, or a trapezoidal wave pattern. The sinusoidal wave pattern and the trapezoidal wave pattern may include a plurality of waves having a same or a different wave frequency.