How do I assemble the armrests on my Graco booster seat?
Insert each armrest into the base until the buttons snap into the slots on the side of the base. Select the desired armrest height for your child and insert the height adjustment screw, then tighten it. Check that the armrests are securely attached by pulling up on them.
From the official Graco Booster Seat with Back Support manual, page 9
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