In an embodiment, a current internal corrosion level at a current time is read from an internal corrosion sensor that is internal to a computer. Thereafter, the other of the two lock keys is pulled out of an engaging recessed portion by controlling the valve timing of the intake valve to a phase-retard side with respect to the intermediate lock position. A tensioner is slidably disposed on the handle and includes a clamp for receiving ends of the flossing string. The support members provide an isolated heat dissipation path for heat, produced by each of the one or more electronic circuit cards, to be removed from the enclosure. The fingers are moved into a closed configuration when the keypad 25 is installed in said electronic device such that a key on at least one finger is positioned in close proximity or is contiguous to a key on an adjacent finger.