Attachment method and apparatus

Abstract: An attachment apparatus may have a fixed engaging surface, and a movable unit that can be attached to any of a series of holes in the fixed engaging surface. The movable unit has a mating surface and a locking mechanism. The user selects a series of holes, inserts a series of properly spaced tabs on the mating surface into the selected holes, rotates and/or translates the movable unit with respect to the fixed engaging surface so that the tabs on the mating surface engage the fixed engaging surface and prevent the movable unit from being pulled away from the fixed engaging surface, and engages a locking mechanism that secures the movable unit in its rotated and/or translated state so that it may not be counter-rotated/translated and detached from the fixed engaging surface. The locking mechanism may be one or more pins that extend through both the mating surface and the fixed engaging surface. The pattern of holes that matches the tabs from the movable unit is repeated on the fixed engaging surface so that the movable unit may be positioned in various locations as desired by the user.