Graco Headwise 65 Instruction Manual page 50

9. Tighten Top Tether Strap
Remove all the slack.
10. Test For Tightness
Grab the sides of the seat where the
LATCH strap 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 5-A to secure your child.
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