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+1 Work on them slowly prying piece by piece carefully.
From what I could tell, they are made of some bunched up very tin metal foil that is packed with pure carbon (like pencil lead carbon). If you poke on that directly but being careful not going through it all the way and not skipping and going into the head, they will start peeling and coming off.
It gives you an appreciation of how carbon is considered a dry lubricant, it is really slippery once you start to get it on your gloves.
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