The invention provides for a novel apparatus and a method to effectively manage ballast material. The bracket contains a locking piece toward the bearing carrier. The predetermined time is set to be longer than a core operation time for the memory core to perform a single operation. The mirror is of a chosen size such that when attached to the mat at the proper location, the user can observe their eyes while swinging the golf club. Further, the apparatus reduces image defects, including granularity and the omission of the trailing edge of an image, even if the range over which the magnet brush and image carrier contact is reduced. Each of the sidewalls defines a groove.