There's also the J. R. Rury Violin Shop in Dallas, but I'd highly recommend David Graham in Arlington (see link in previous post). His shop is bass only.
If I could make a recommendation I would get in touch w/ Michael Hartery in Denton. He has done extensive work on my bass and others in the Ft Worth Symphony. Michael is a bass player himself and a very skilled luthier. MHartery@aol.com
Julie Vinsant
I would also recommend Joel MacMillan at the string repair shop at UNT. He is also a bass player and former employee of Robertson's violin shop. jmacmill@music.unt.edu