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    Zanussi ZKG5540 with narrow travel of gas hob regulation knob

    I have a second hand Zanussi ZKG5540 with four gas hobs and two gas ovens. The flame of the hobs is adjusted by knobs and it's supposed to go from minimum to maximum over an angle wider than a quarter of full turn (let's say 100 degrees rotation). In reality the angle is much narrower...