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http://www.peachparts.com/shopforum/tech-help/196479-ignition-switch-w126-knee-bolster-duct-tumbler-removal-tool.html gefunden:
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The manual I have doesn't say how to remove that huge steel airduct tube behind the knee bolster panel, and I haven't seen a post on this either. This was another thing that stopped me before. I had better sense or whatever this time, and found it comes out only after you remove the cover panel, then the 'L' bracket holding the left lower dash corner in place. There are 2 10mm nuts on the left side, gotten at from below, and 1 13mm bolt accessible through the dash opening after the instrument cluster is out, which also secures the tubular brace to the steering column. No need to remove this bolt, just loosen and pull the steel tube down. Pic shows the nasty bracket holes/slots at each end. It's a bear to get back in though.