I may be confusing it w/ another of Mike's basses, but didn't Modulus make Mike his TBX in a limited run when Phil Lesh got his last last bass from them? if i recall, Modulus made a 6er for Phil and David Schools, and they made a 5er for Mike.
Not sure. I don't think that Schools plays a TBX...he normally plays a Q6...but all of these guys have closet basses that they don't mention or play live.
