Graco Model Type 7479 Owner's Manual page 72

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PUSH DOWN on the top of the infant restraint
slowly but firmly to make sure the vehicle belt
does not lengthen at all and that the vehicle
belt or LATCH is fastened very tightly around the
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infant restraint/base .
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Holding the infant restraint near the vehicle belt
path, TWIST AND PULL the seat forward and to
both sides to make sure the vehicle belt or
LATCH does not lengthen or loosen and the
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infant restraint does not easily move .
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