If I pull lens board out on my speed graphic-
it has been getting stuck on the rails - just past the hinge area of the camera- which makes it impossible to focus- or return to closed position. I can't see any "stops".

Also, the lens board has tilted down- but don't know how I did it.

Haven't used the camera in several years.

look at the chrome struts that hold the bed in the dropped position, if you push in on them they should allow the bed to come up to normal, this should allow the front standard to pass the hinges. If the lens is a typical 127 135mm the stops should be on the rails about 3 inches from the hinge.