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I have no idea what I'm talking about- having never done this, but, would it not make sense to put (something like) a light layer of valve lapping compound into the area, and spin a spare lug nut against it to remove the unwanted layer?
There would be various ways to spin the lug nut depending on the speed needed and what you have laying around.
edit- wouldn't address the backside though.
Last edited by LEAKYSEALS951; 03-21-2021 at 05:46 AM..
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