Because the hair is on the prints that I had developed today, I rushed to my camera repairman/friend before he closed. This is what he said you should do. Of course, don't do this with film in the camera.
Remove your lens.
Set the speed on B, that is, the slowest speed, because it will keep the shutter open for the longest time. If you don't have a B, it's the longest opening time. Short ones are 1/500th of a second, 1/250th of a second. You want it open for the longest possible time.
Looking at the camera while the lens is off and the shutter is open, you should see a fine hair, we think your left at the bottom. You might need a magnifying glass and/ or bright sunlight to see it and you might need a tweezers to remove it. Before you even try, be sure you don't have lint on your hands that could cause more problems.
There you go. The solution from awesome experts in Raleigh, North Carolina, in the good ole USA. Good luck!