Be forewarned: 0.010" is very small. It's the one single slot that's most needy of a tool narrow enough to reshape the slot without being too wide. I have a couple of specialty saws that will do, the thinnest blade on a "Zona" saw, supposedly the saw in an X-acto set; but I have one of those and it seems too wide. There are of course also nut files available from Stew-Mac, LMII etc. also. The point is, it's a lot easier to use the narrowest implement on all your slots first, then widen as needed. I'm a big fan of "cowboying" it when it comes to tools; most of my favorite files had no idea they were guitar tools, but that one little slot...
Now, in theory, your slot doesn't even need to be that narrow, if it's shaped perfectly the backside of the slot will ramp all of the way up to the top of the slot, which will have a rounded bottom so the string doesn't have anything extra to vibrate against; when you can do these, you get a gold star.
It's fairly easy to visualize exactly what a nut slot needs to be shaped like, but you're getting into tiny stuff here, at 54 my most important nut tools are my Optivisor, and a handheld 10X magnifying loupe. And bone and silica-hardened delrin ("Tusq") are really SOFT stuff in the greater picture, one too many overly-enthusiastic strokes with the saw or file -
oops. :sad1: :sad1: :sad1:
http://www.lmii.com/CartTwo/thirdproducts.asp?CategoryName=Knives+%26+Saws&NameProdHeader=Zona%99+Saw
http://www.stewmac.com/shop/Nuts,_saddles/Special_tools_for:_Nuts_and_saddles.html?gclid=CO2E6pTWgrACFUZN4AodayxoGg
http://www.stewmac.com/shop/Nuts,_saddles/Special_tools_for:_Nuts_and_saddles/Gauged_Saws.html
http://www.doneganoptical.com/optivisor.php