Century ISPB008BA - Manual (Page 25)

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With Harness System:
The locking latch plate on some seat belts may
slip and loosen after being buckled on car seat if
positioned at a certain angle. If this happens,
flip latch plate over (fig. a) and re-buckle. Test
installation again to see if this works. If not,
move car seat to another seating position.
Without Harness System:
DO NOT use this type of vehicle seat belt to
secure child and booster car seat.
(fig. a)
Lap Belts - Manually Adjustable
Flip
VEHICLE SEAT BELTS
(continued)