I recently bought a Super Speed Graphic kit that came with a 3 cell graflite. The camera has a modern 150mm Schneider lens with an "X" PC post. I went out and got a household-> pc plug, loaded up my graflite, fired the shutter, and got nothing. I tried various configurations but couldn't get the flash to fire. What am I doing wrong here? Do I need an old style bi-post shutter? Is there any way to get this combination to work?