Chevrolet 1979 Light Duty Truck Owner's Manual page 19

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To unfasten the belt, push in the button in the center of the buckle.
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The retractor is designed to rewind the belt automatically when
the front door is opened, or when the belt is pulled out about six
inches. Hold the latch plate as it retracts to keep it from possibly
striking people or things nearby. If needed, slide the latch plate
down the webbing to let the belt retract fully.
Front Seat Lap-Shoulder Belt (Pick-Up, Subu rban
and Cab Chassis)
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Sit up straight and well back in the seat.
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Pull the lap-shoulder belt across the body far enough to push the
latch plate into the buckle, until it clicks.
P L A T E
(US H BU
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Position the "lap" portion of the belt across the lap as
THE HIPS as possible. Then adjust to a SNUG FIT by pulling
the belt firmly across the lap toward the lap belt retractor, so it
can take up slack. This reduces the risk of sliding under the belt
during an accident. The belt retractor is designed to take up extra
webbing.
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