This is actually my first post on the board but I've been lurking around for a while since I got my first SG, looking for answers to my tuning issues. Clearly I'm not the first person that has run into this issue with the SG Original 2 and I certainly won't be the last, so I figure I ought to throw my exeprience on to the pile for the sake of further verifying some of the issues these gorgeous guitars have been bringing home with them. I picked mine up a month ago after a good half year of hunting for the right vintage style SG. I absolutely love the look of Gibson's tailpieces and really wanted to find myself an SG with the old style vibrola, finally one showed up on Craigslist, near mint condition w/ receipt and original packaging for a good price. The guy said he was just over the 30-day return policy when he changed his mind about it, claiming that he's more of an acoustic guy, wanting to sell the SG for cash to put towards a Martin. This was the first time I had seen or even heard of an SG Original, I was basically looking for something similar to old SG Customs or a Robby Krieger style SG, the SG Original fit the bill, and the second I saw that spotless dark cherry finish there was no turning back. The guy welcomed me to play around with it for a while before committing to the purchase and at the time it felt completely reasonable to blame the tuning issues on the fresh set of unstretched strings, I was just eager to take the masterpiece home to my amp for some 1 on 1 lovin', so off I went SG Original in hand, my first Gibson, grinning ear to ear. I spend all night jamming with it, throw a set of my typical D'Addario .11s on it, stretch em' for another hour, place it proudly upon its stand (front and center as the new crown jewel of my guitar family) and head off to sleep. I bring it to rehearsal the next evening, we start running through our set, and to my surprise the axe won't stay in tune for a single song without at least two strings drifting a half step flat (with little to no trem use). We keep going hoping it's just new strings but no improvement, I swap with my ol faithful Telecaster and we finish up, agreeing to drop the SG off with our bassist's guitar tech for a check-up. Spent a suspenseful week praying to the Gibson Gods to have mercy on my vibrola, the last thing I wanted to hear was that the absolutely stunning Lyre trem was to blame. Finally I got it back last Friday along with the news that it was simply a poorly cut factory nut that needed some serious filing (especially to play nice with .11s) and lubing, the previous owner had .09s on it and even those were catching at the nut. It's rock solid now, even with frequent trem use. I've read a lot here about users opting out of the Nashville bridge for roller bridges or ABR bridges in addition to servicing their nut but I don't think I'll be taking that extra step, it seems to be performing fine now with just the serviced nut. So TLR; Seems like with the SG Original line the tuning instability issues always seem to surface either at the nut slots or at the Lyre Vibrola/Maestro's breakover angle. More often than not the nut is to blame, most users here seem pretty satisfied with their Lyre trem performance.