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On the "EB" aerators, the aggressiveness of the tines is adjusted by means of a pressure crank placed in a vertical position between the levelling scrapers and the spring tines. A graduated scale allows you to check the selected setting.
The gauge wheels on the JOSKIN aerators are primarily used as a height adjustment system for some implements (a key element of an aerator). They can be made of steel (advantage: no punctures) or reinforced rubber (advantage: flexibility). When working on very hilly lands, it is advisable to increase the number of gauge wheels to better follow the ground relief.