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In a moment we will mount this contact arm at the bottom of the vertical block using the remaining screw. But first let’s assemble the alarm.      TYING THINGS TOGETHER. Attach two 9” lengths of wire to the doorbell terminals. Put the battery on the wood base, and hold the doorbell against the back of the battery. Now for a compact package, tie the bell, the battery, and the vertical block together tightly with tape or cord.