My brother bought a secondhand Gibson SG and a beautiful instrument it is (if you like SG's that is. Personally I am not a fan). It was a dog to play. He'd fitted 9's, in place of the 13's that were on it when he bought it, and the fret board was well bowed with the 9's. What it had been like with 13's, I hate to think.
He asked me to do a set up, so after acquiring a truss rod key for the Gibson, I did my stuff. Once I had tensioned up the truss rod (moved no problem), I had to raise the action considerably. I then raised the pickups to match as Peter loved the sound and volume he was getting. I had to intonate the 1st and 4th strings, but all the rest were spot on. I thought I'd get a shot of adjusting the nut, but it didn't need it.
It played beautifully once done and when my nephew came to pick it up (my brother had decided to pass it on, but that's another story), he was thrilled to bits with how it played.
My reward? A bottle of The Glenlivet Founder's Reserve. A wonderful tipple.