Okay mod completed. Smooths out the treble peak with out effecting the resolution. Took about 15 minutes including messaging the creator to verify i had done it right. I bought this cotton sheet from Amazon: Dynarex Cotton Roll – Non-Sterile, Soft and Absorbent Cotton in an Easy to Tear & Use Roll, 1-pound, 12” x 56", White, 1 - Dynarex Cotton Roll - $12.99 - https://www.amazon.com/dp/B00J4OITME
1. Take off pads.
2. Remove these four screws
3. Cut out cotton in the shape of the pad.
4. Trim some cotton off to until it fits. 5. Fluff it up a bit so it fills the space.
6. Don't rip out the wires in the process.
7. Reassemble and repeat on other side.
This is my modification: I used two layers of the sterile cotton pads.
Result is amazing! It has excellent reduction in the peaks and make it very enjoyable. In the past I have to use a suede pad but the suede pad also kills the bass and sound stage a bit.
Quick thought: In all the Fostex mods of wooden cup, these cotton / dampening materials are usually there. Maybe it is necessary (just like the speakers?). I haven't seen the teardown of ZMF headphone though.
Question: Do you know how thick the cotton should be? I saw the Dynatex is thinker.