My question is what should the height of a retainer be in relation to the nut slot? I just got a Jazz style 5'er that has a single bar string retainer across all the strings. It is positioned right behind the nut (half inch-ish). The B string side was higher than the G side. I'm assuming this needed to be leveled and have screwed it down to match the other end. Right now the height of the retainer puts the strings slightly below the nut slots. The B and E seem like they really torqued with a lot of pressure from this angle this makes. Is there a rule of thumb?