Graco Extend2Fit Instruction Manual page 58

11. Tighten Top Tether Strap
Remove all the slack.
12. Test For Tightness
Grab the sides of the seat where the
lower anchor 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.
Always test for tightness after adjusting
the seat recline.
See section 6-A to secure your child.
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