Graco SLIMFIT Instruction Manual page 26

9. Tighten Top Tether Strap
Remove all the slack.
10. Test For Tightness
Grab the sides of the seat where the
forward-facing belt path is and slide the
car seat side to side and front to back.
If the seat moves less than 1" (2.5 cm), it
is tight enough.
See section 6-A to secure your child.
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