If you install a roller nut on a guitar neck with a zero fret, will you still get the benefit of the roller? Second, related question: on a guitar with a zero fret, is the nut placement as critical as it is on non-zero fret guitars? For example, when one installs a roller nut on a guitar without a zero fret, one typically needs to move the forward edge of the nut 1/16" closer to the bridge to preserve correct intonation, as the string "breaks" over the roller 1/16" back from the front end.. This requires some fretboard surgery, typically. Do you have to do this if you are installing a roller nut on a non-zero fret neck?