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I've done plug replacements on Sennheiser headphones: at least on the HD428s, the three wires are red (right channel), blue (left channel) and orange (ground). Usually when i do this sort of thing I have a solder gun (one of those big, 100 watt monsters) to burn off the thread inside/take off the coating. I'm not exactly sure how to work with the wires found in these headphones in terms of stripping/soldering them to a new plug. Has anyone had any experience/luck in doing it with just a regular (40 watt) pencil iron and some diagonal cutters/wire strippers?