It's called " Burnishing " and the special files are called Burnishing Files , they're much finer than 600 grit .
In a pinch I'd use 1,000 grit but never anything coarser than that , certainly not 600 grit .
I get E-Bay or Amazon still has Burnishing files , I have some that are 50 + years old and they work fine .
-Nate
Mirakelworkre Wrote :
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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