Dürkopp Adler 550-12-23 Bedienungsanleitung Seite 166

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Setting of different stroke heights for the sewing feet
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Loosen screws 3. Turn eccentric 4 45° in the direction of the
seamstress so that the slit lies horizontal in the upper
semicircle. Tighten screws 3 again.
This setting achieves that the intermittent foot rises 2 mm and the
transport foot 2.5 mm.
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