The oldtime locksmith I used to do business with would use the kind of magnifier a doctor uses to look into my ears to inspect the tumblers of a lock cylinder, and hand file a blank key with a set of jeweler's files. He rarely if ever had to file a second blank. Sadly, he's working on the lock on the Pearly Gates now!
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!