Hi, I was wondering if any of my fellow talkbassers out there could give me a little help or advice. I have recently put a Hipshot D-Tuner / Bass Xtender on my '93 Stingray 4 string. I tune up before jamming with my band and after about a song or two, I notice that my E string has gone out of tune (a little flat). This is while playing in standard tune....not flipping the lever to drop D. The strings are about 2 months old, so they are definitely broken in. Maybe it has to do with the screw for the tuning key post on the Hipshot? I do hand tighten it periodically to snug it up and it still goes out of tune a bit. Maybe I need to put a little Loctite in there so the screw doesn't come loose. Or maybe it's something else. Any help or advice would be greatly appreciated. Thanks!!!