What is the advantage of the knife shaft being aligned with the front wheels of the scarifier?

In the category Scarifiers

Because the knife shaft on the scarifier is positioned between the two front wheels, it perfectly follows the slope of the terrain. This prevents the knife shaft from cutting into the lawn, resulting in the necessary damage. Here too, the life span of the scarifier benefits from this.

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Jo Beau 'Next Generation'

Jo Beau gave his professional line of wood chippers a new reinforced design, the 'Next Generation'. Curious?
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