awp is right regarding a good BASS luthier. I visited a shop in Toronto specializing in stinged instruments (mostly violins, violas, and cellos), and their bass setups were very poor. I won't go in the details, but some of it was actually pretty sad. The UB is a specialized instrument that requires a specific skill set from your luthier. If your on the left coast, check out Jake at The Bass Spa (www.thebassspa.com
), George Heinl in Toronto, and I'm sure other folks can point out good shops elsewhere.