CYBEX SOLUTION M-FIX Owner's Manual page 24

SECURING YOUR CHILD IN THE BOOSTER SEAT
Step 1
Position the shoulder belt inside the Belt Guide under the
Headrest, making sure it is threaded INSIDE the area.
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Step 2
Pull the shoulder belt down across your child's chest while
guiding the lap belt underneath both armrests.
Step 3
Buckle the seat belt, making sure the shoulder belt passes
underneath the armrest on the buckle side. Pull up on the
shoulder belt to remove any slack.
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