Graco Contender Slim Instruction Manual page 45

8. Tighten the Vehicle Seat Belt
Press down firmly in the center of the car seat. Pull on the
shoulder belt to tighten while feeding the slack back in the
retractor.
9. Test For Tightness
Grab the sides of the seat where the vehicle seat belt is
and slide the car seat side-to-side and front-to-back.
If the seat moves less than 1 inch (2.5 cm), it is tight
enough.
10. Check the Level Indicator
Vehicle MUST be on level ground. Ball must be
completely in the blue area. Readjust if needed.
For infants 3 months and under, the ball must be entirely
in the light blue area.
If needed, rolled towels may be
placed under the car seat at the
vehicle seat crease, until the ball
is completely in the blue area.
See section 5-A to secure your child.
Recheck the level indicator with child in seat.
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