I remember the old cars with contact points in the distributor. those contacts has a special hard coating on them. Filing with something coarse would grind off that coating and they would stop working quickly. A very fine piece of sandpaper (about 600 grit) like auto body shops use was best. I always kept a piece in my glove compartment.. ALWAYS wipe the points clean with a piece of cloth afterwards so grit will not keep contacts from making contact. Electronics suppliers sold special files for contact points back in the day (very fine grit).
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