I've had my new American Ultra Stratocaster for about 4 weeks, played about an hour or two each day. Original strings still. I broke the 0.009 high E the other day, it broke off right at the locking tuner. I can't remember when I last broke a string while playing (I used to play Floyd Rose guitars almost exclusively for a long time). So I put a new D'Addario set on and the 0.009 broke again right while I was adjusting intonation and tuning up. Again at the tuner. I figured the hole for the string has a sharp edge and due to the practice of doing as few as possible windings on a locking tuner, it just happened by poor luck to have the sharp hole edge right where the string vibration ends (if you know what I mean). I tried sanding off some of that rough edge a little and put another 0.009 on. A little worried now since I do have a show this Saturday where I wanted to show off my new Stratocaster. Any similar experiences here and/or recommendations on how to fix or remedy the locking tuner issue?