Ok I have a crappy Squier guitar... the intonation is terrible especially on the G-string... I've moved the string saddles further out, but is still very bad.... I was also noticing that while tuning the other day that the tuners didn't turn very well and it took a bit longer than usual to tune the guitar... I was wondering if I replaced the tuners could that help solve both problems? Also, how would one go about replacing tuners?