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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 letís assemble the alarm.
TYING THINGS TOGETHER. Attach two 9Ē 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.