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CONNECTING THE CIRCUIT. The battery and lock are connected in series with two terminals (machine screws) that come through the drawer from the outside. Wires from the coil and battery are attached to these screw terminals with nuts.      Anything metallic that can touch both outside terminals at once will be your “electric key.” It could be a coin, a scout knife, a metal-edged ruler. Of course, touching the terminals and pulling on the drawer will have to be done at the same time. And it should be done quickly, to conserve the battery.      FREE ADVICE. Here’s an idea on how to dis- guise the outside terminals. You could attach some sort of nonconducting (cardboard, wood, plastic) emblem or nameplate to the drawer front and use decorative screws as terminals. But even if you do nothing special with the screws, no one is likely to guess the secret of how the drawer is locked or what must be done to open it.      Incidentally, when the battery inside the drawer starts to weaken and can’t quite pull the rod all the way down, you can still open the drawer by applying 6 volts (in the right + to – direction) to the outside terminals, But don’t let the battery die, for then you will have a little problem on your hands.