Here`s the story: I sometimes use a low D in some of my band`s tunes. Some of 5 strings basses work great for this but I feel more comfortable with 4ers. I decide to add a Hipshot Xtender to reach that low D without the need of an extra string. I followed the instalation and tuning procedures that came with it, but can`t tune properly. The bass is a Warwick Streamer Stage 2. The point is: when I flip down the lever it doesn`t reach a whole tone. I`ve tried adjusting the tuning screw that comes with it without success. Has anyone experienced anything similar to this ?