An accessory (100) has a housing (102) for varying a number of accessible poles (110A, 110C, 112A, 112C, 112E). The accessory includes a plurality of projections (110, 112) each having at least one pole coupled to an insulator (110B, 112B, 112D) to prevent electrical contact with another pole, a plurality of conduction wires (219) each insulated and connected at a first end to a corresponding pole of the plurality of projections, and at least one lever (105) coupled to a corresponding one or more of the plurality of projections for sliding one or more projections in and out of the housing in a plurality of positions (106A-C) after a force is applied on such lever, thereby controlling the exposure of a portion of at least one pole of each of one or more of the projections.