Thread the vehicle belt through the belt path at the foot of the base. If the vehicle lap and shoulders belts are attached, thread both through the belt path. Buckle the vehicle belt and adjust as tightly as possible by pushing down firmly on the base while pulling up on the shoulder belt until the lap belt is tight. It is not necessary to make the base completely immovable, but the base should not move more than an inch or two from side to side.
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