Oldsmobile Silhouette Owner's Manual page 174

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Reposition the tie downs by turning them
counterclockwise, then slide them along the side rail.
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Turn the tie downs clockwise to tighten them in place.
If you wish to attach the luggage tie
compatible bicycle or ski accessory racks to the
crossrail, use the adjustable tapped plates under the
bumper strips.
2-78
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Use the adjustable tie down
loops in the side rails to
help secure large loads.
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downs or other
Lift the end of the bumper strip with a flathead
screwdriver and cut off enough of the strip to access the
tapped plates.
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