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| Push side trim -2- slightly towards backrest. |
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| Use a screwdriver to lift retaining catch -1- up slightly and disengage. |
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| Turn backrest adjuster knob -3- and disengage another retaining catch. |
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| Remove backrest adjuster knob. |
Installation is carried out in the reverse order; note the following: |
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| Push on adjuster knob until it engages audibly. |
Note If backrest adjuster knob has come loose on adjusting shaft, backrest adjuster knob must be renewed. |
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