Dirtychuck, I used to have this problem quite frequently. I am not sure what stopped it unless the meter face was sealed better. I used to open the faceplate up, face it down and spray a small amount of WD-40, Tri-flow etc. on the switch shaft. Then flip it over and do the same thing from the outside of the switch. Keep turning it until it frees up. If not, replace it. They make plastic rotary switches, I think.