A movable barrier drive case and a clamp wherein the clamp can be configured and arranged to securely and non-temporarily attached the movable barrier drive case to a mounting channel. In an implementation, a method includes selecting one of a plurality of clients, in which each of the clients has a client profile which describes the client’s experience with one or more of a plurality of access points. A vacuum is applied through an annular passage defined between the tubular body and the rotatable element. The sheet 400 is formed on its outer surface 400a with undulation comprising crests 401 and troughs 402 alternating in the one direction P and the crests 401 and troughs 402 extend in a direction intersecting with the one direction P across the pair of electrodes. The water-draining basket, which rotates in tandem with the rotating shaft part, is provided to a periphery of the rotating shaft part.