Do not file it. You will thin it too much.
They are made of nickel silver. Which will develop a green buildup of gunk between the material and the wood over the years. This will cause it to get pushed up from the wood. Since there was no other means of fastening them originally than the two nails that are in it. So the condition of it usually is not due to refinishing. Just the natural order of things.
You should removed it, clean the backside and the inletting and re-install it. It MAY lay down nicely. But the inletting may need to be deepened some.
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B. Dudley
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