This procedure is commonly performed to replace clock batteries.
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Place your hands at the 10/11 and 4/5 positions.
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Turn each clock counter clockwise to unlock the clock housing from the twist-lock mount.
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Reassemble clocks to bracket.
Place clock in the housing with the 10/11 and 4/5 numerals over the brass posts.
Place your hands at the 10/11 and 4/5 positions and turn the clock clockwise to lock into place.