I'm having a lot of issues keeping this in tune; my first suspect is the nut which is a kind of light gray color. Besides replacing that, can anybody tell me what kind/brand of tuners come stock on this guitar and what a good replacement would be? Any insight on size of the headstock holes and alignment pin location would be appreciated. I'm reluctant to start work until I research a bit; a playable version of this thing with the rosewood was REALLY hard to get hold of. Thanks all.