Some band like slipknot do down tuning but are they use 5 string that install 4 top string without g string .like just top four. Do they use a 5 string gauges one four string bass or its the 4 string normal gauges that downturn? Is it possible install b string gauge on four string instead of e,can nut accept bigger size? What is the trick are there instruments ,that made four tune bead and nut is make for this use or their instruments are normal eadg bass with normal nut that they install other style? When I look at my nut it looks I can't put bigger string on lower nut place .its seems I can't install e string gauge on the place a string on nut .