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After the Center Column is extended to the desired height, turn the twistlock in clockwise direction to securely lock the column into place. For additional extension (CT-3441S and CT-3441SB only) there is a telescopable second Center Column Section which can be released by turning the top twistlock located just below the top of the lower Center Column Section (see picture) a half turn in counterclockwise direction, extending, and securely re-locking the twistlock.