Nut Replacement.

[Golem]

This would be a pretty inexpensive set to cut the nut with. Either that, or take it to a luthier that could do it. Probably wouldn't cost much more to have it done.

http://www.stewmac.com/shop/Tools/Files/Needle_Files.html

I got my files from the "Musician's Lifestyle Supplies and Gift Emporium", known to civilians as "the Dollar Store". Two sizes of rat-tails, a triangle cut, etc, six in all, for one inflationarily deflated yanqui greenback dolluh.

If you start with an EB blank, the files should be all you need. I did mine using a huge generic blank, so I was lucky to have 'won' the Dremel tool in my diviorce settlement cuz there was about 300% more material on that blank that what is left when it's down to StingRay shape.