The invention relates to a teaching part (1) for adjusting the distance of adjacently arranged rhomboid slats (2, 3) a bar facade, the teaching part (1) an elongated central part (1.2) and two from each end of the middle part (1.2 ) projecting side parts (1.1, 1.3) and wherein the thickness of the middle portion the distance between the slats (2, wird.Der limited 3) distance between the side parts (1.1, 1.3) is greater than the width of the upper cross-sectional area of the slat ( 2). Between the middle part (1.2) and the recess-limiting part of the one side part (1.1) is an obtuse angle enclosed between the central part and the recess defining part of the second side part (1.3) an acute angle is included.
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