A manually adjusted lap belt is tightened by pulling on the excess belt while pushing down hard on the car seat. However, you may have trouble tightening the belt because of the upright angle at which you must pull. You may have to unbuckle the vehicle belt, estimate a belt length that will make the vehicle belt very tight, then buckle it again.
9.Tightening a lap/shoulder combination belt:
A lap/shoulder combination belt with a locking latchplate is tightened by pulling hard on the shoulder portion of the vehicle belt while pushing down hard on the car seat. However, you may have trouble tightening the belt because of the upright angle at which you must pull. You may have to unbuckle the vehicle belt, estimate a belt length that will make the vehicle belt very tight, then buckle it again.
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