Graco NAUTILUS Child Restraint/Booster Seat Owner's Manual page 28

5. The harness straps must go into the slots
even with or just above the shoulders
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If straps are in proper slots go to page 32.
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6 . To adjust harness straps:
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a) Turn seat around, so you will have access to
the rear of the seat.
b) From the rear of the seat remove straps
.
from metal junction plate
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28