Graco TURBOBOOSTER LX Instruction Manual page 6

3. Head Support Fabric
Insert the fabric from the head support underneath the
fabric on the lower back support as shown.
To make insertion of fabric easier, slide the upper and
lower back pieces apart by pulling the adjustment lever.
4. Attach Seat Back to Base
The "U"-shaped hooks on bottom of the seat back will
interlock with bars on the base.
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