I've resurfaced more than a few of those washers myself, and had the missing fingerprints for a while to prove it. Getting enough of a grip on that little washer to scuff it across a piece of sandpaper on a sheet of glass is quite a challenge!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!