Chevrolet 1993 Astro Passenger Owner's Manual page 51

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5. Press the button on the retractor cover to set the lock.
6.
To tighten the belt, feed the shoulder belt back into the retractor while
you push down on the child restraint.
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7.
Push and pull the child restraint in different directions to be sure it is
secure.
To remove the child restraint, just unbuckle the vehicle's safety belt and
let it
go back all the way.
The safety belt will move freely again and be ready to work for an adult or
larger child passenger.
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