I was cleaning my 82 LS yesterday after a day of riding and noticed a slight brake drag while cleaning the rear wheel. The bike was on the center stand and as I turned the wheel to clean it, I hit a spot that I could feel the brake shoe drag. Not much but it was there. It is almost as if there is a high spot on the drum of it is out of round. I don't notice any unusual vibration when riding and no unusual feeling when using the rear brake. Any ideas or suggestions?