A resistivity imaging tool is used in a borehole having a conductive fluid. The device provides rolling support for material in the process of being cut or otherwise manipulated. A user may be presented with various financial scenarios based on information provided by the user. At least two of the plurality of row drivers are configured to simultaneously energize at least two of the plurality of row of electrodes. A displacement mechanism is provided for displacing a contact point between the control arm and the swing cam surface and a contact point between the control arm and the rocker-side surface.