You can take a look here:Are there any good tutorials for working on earbuds? A lot of what I'm finding on YouTube is about replacing the jack or splicing the cable. A lot of the stuff that does show how to work with drivers is in bad quality or isn't shot well. I can't really seem to find anything about opening or otherwise working with shells or tuning.
https://docs.google.com/spreadsheet...36LeS5JB7ZuFDAgJbTCm8/htmlview#gid=1015381048