Graco 8480 - Manual (Page 30)

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e. Re-buckle the belt and pull hard on the lap
belt to be sure it does not move.
f. Repeat this procedure if the lap belt is loose
or lengthens when pulled.
Remove locking clip from vehicle seat belt
when not being used with a car seat. The belt
will not properly restrain an adult or child and
serious injury could occur. Store locking clip
under its tab on the back of the car seat.
Do not use locking clip as a vehicle belt
shortener.