Haha, sorry. But I couldn't help myself. I have made a mod to my HMZ. Again, reversible and doesn't harm the headset in case later you can get full retail for it on trade in or sale.
I still had my original Beta tester Xbox Live mic from 2002. I disassembled the mic assembly, removed the speaker and tidied up the internal of the housing. Now I have a LIVE mic, attached to my headset and I can play on LIVE without modding the headset of ruining the looks of it. It actually looks kinda cool. The mic is attached with GOOP, a super strong adhesive that is flexible and when pulled doesn't leave any marks. You just use Goo Be Gone and its like it was never there.
So far it works fantastic. The quality of these original Xbox mics is awesome plantronics. Crystal clear to my friends. I switched voice to "speakers" and lowered the volume and now I can get game and voice sound just like if I was using my Astros A40s. The quality isn't as nice but to be honest the trade off is worth it.
Simple modifications to the Xbox headset housing with a dremel to match contour and snipping of speaker wire.
I'll keep working on non destructive mods for the HMZ-T1