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| Turn backrest adjuster -1- until retainer is visible from rear -arrow A-. Use a torch if necessary. |
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| Hook in assembly tool -3399--2- and lever in direction of arrow -B-. |
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| Turn backrest adjuster a further 120 °. |
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| Hook in assembly tool -3399--2- and lever in direction of arrow -B-. |
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| Remove backrest adjuster. |
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