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Normal
On pre-Generation modelsI've also notice that the tension on the handle spring can affect whether or not the nozzle maintains a good seal. If the spring is too tight, it will cause the nozzle to lift off the carpet too easily when pulling the vacuum backward. At that point, you have one of two choices: either click down one more notch (which makes it harder to push), or loosen the tension on the handle spring.
On pre-Generation models
I've also notice that the tension on the handle spring can affect whether or not the nozzle maintains a good seal. If the spring is too tight, it will cause the nozzle to lift off the carpet too easily when pulling the vacuum backward. At that point, you have one of two choices: either click down one more notch (which makes it harder to push), or loosen the tension on the handle spring.