I have a Speed Graphic Pacemaker. I suppose that everything works fine, except for the focal plane shutter at the back. All the speeds seem to be accurate when the camera is sitting normally, but when it is sitting on its side (where you would attach a flash gun) the shutter speeds are affected and are slower.
The interesting thing is that if I hold the camera upside down then the shutter still works normally, and if I hold it in any position, just holding it to the side gives me shutter problems. What could be causing this and how do I fix it?