2000 Gibson SG [4.5 lbs] :: broken tuner & setup.
The player had been noticing that his G string would not stay in tune. After talking with him he remembered that he had bumped the headstock, specifically on the G tuner. It did not look obvious at first, but the rear casing of the tuner had broken loose. This allowed the gears to float slightly and not mesh tightly. We ended up just replacing the G tuner so I slightly tarnished the finish to better match the other tuners.
The setup included changing from 11's to 10's, cleaning the electronics, tightening the output jack and deburring the saddle slots.