A method, an apparatus, and a computer program are presented for carrying out channel reservations in a wireless communication system. The apparatus includes a curved, elongated support member elastically deformable and having first and second ends. The blade and the counter blade are rotated only at the time of cutting. A projection on the first retainer engages the receptacle to prevent removal of the first retainer radially from the cutter pocket. When positioned in an interior corner of an automobile door frame, the wedge keeps the window of the door from sliding down, and may secure the window in a fully closed position. The electrolyte can be covered with a membrane which is permeable to the corresponding ions, or alternatively a gel electrolyte may be used.