A computing device is configured to capture accessibility information for remote technical support diagnostics. The rate of longitudinal advance is controlled such that the hole remains substantially a flat-bottomed hole as it is cut. The credit card shape of the toothbrush assembly allows it to be carried easily, for example, in a shirt pocket. One or more transient DC voltages are applied to the electrodes of the ion guide or mass analyzer in order to urge ions along the length of the ion guides or mass analyzer.