So REALLY over-discussed subject. I must be stupid or something, because I just can't get this to work on my guitar! I've heard plenty of discussion on strings not staying in tune. And, of course, the G string won't stay in tune. So, how can I tell if it's the nut or the trem bridge causing the problem? The string doesn't ping when tuning, that would be too easy. Got a tremsetter, and using two additional springs. Bought roller saddles. Watched the video on balancing spring tension vs string tension, and set it up that way. No Joy. Ideas? Thanks in advance!