[MikeK]

Originally Posted by Purdy Swoft

My wife had a Diamond Deb fingernail file, really!! I'm not sure that it really had any diamonds impregnated. My wife, Deb, frowned on my using it on the model A points. I'm pretty sure that it would have worked well.

I believe the abrasive is actually corundum, bonded with nickel and overplated with bright chrome. Corundum is an industrial abrasive grade of ruby or sapphire. Many grinding wheels are made of this stuff. (Mohs=9). I have a "DiamonDeb" fingernail file ($5) in my carry-along tools. I've used it several times. Like any use of abrasives on points, the dust may be non-conductive so drag some paper or a matchbook cover through the points when finished.