I'm swimming upstream on this, I know, but I take a different lesson from this: don't attempt to mod headphones unless you're prepared to ruin them.
Headphones, by and large, are a completely manufactured, often machine-fabricated product. Either they're too cheaply made to take apart or they're too expensive to risk it. A headphone company is in the market to compete. It's ridiculous to assume that a headphone mfr is not trying to make the best sounding headphone at the lowest price. So, they've already optimized the audio quality. It may not be to your own particular preference, but they tuned it to sell, period. Likewise for the manufacturing - pricing is so competitive worldwide, that every effort is going to be made to reduce manufacturing and fabrication costs. That doesn't always mean the result is going to be easy to dis-assemble and re-assemble. More often, it won't be - repeatable connectors/fasteners are always more expensive.
I've been a bit dismayed at how this forum section has seemed to transition from electronics and electrical DIY to modding headphones. It seems to be the tide that's sweeping around here lately. There have been some notable successes in modding with the Fostex planars, but those are a glaring exception, not the rule. This thread is an example of that.
I'm sort of hoping that the tide will go out on this headphone modding wave and we can get back to actually creating entire products with DIY instead of the latest blu-tack and sock mods. JMHO, but I'm probably in the minority right now.