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The file I got actually came from a flea market for the low price of $3. The width comes right at .171". I did see some bigger files but they looked like there was some rust in there, so I passed on...

I actually bought a Nicholson file some months back for the sake of doing this one day. Mind you, I don't have any of the required materials (save the file), but it's the thought that counts! I can't...

Really neat stuff, hope to see some more pictures!