Well, here it is 2020 and the problem with the 339 still exists. I gave up on Gibson service who kept saying it's the nut. They serviced it 3 times under warranty. I had put the guitar away for a month, tuned. When I returned to it, the B string was flat by 1 1/2 steps, to G# and the D string was flat by a whole step to C. The rest were only slightly off. Both of those tuners, B and D, have too much play in them, not as tight as the others. Unacceptable! My Humingbird stays in tune all the time varying only when humidity varies, and even then the adjustments are slight. Same head stock configuration, same Grovers, same nut. I haven't had my Humingbird serviced because it didn't need it. Conclusion: Grovers are uneven in quality and Gibson won't replace them on a $3,000 guitar! Totally unacceptable!!!
