One thing to note is that the material is actually slightly different on the one side than on the other. One side is slightly more rounded and the other is more flat. I tried to measure the difference and it seems that it is better to have the more rounded side facing up (like in most pics, except the one on reddit).
Probably something like that.
I also doubt that it sounds better with the cork. Too much 1kHz with the cork. (Just guessing here, I have not tried it with the cork yet. I also don't have the original metal rings in my HD800 anymore - I am using felt rings instead)
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