I just received a nice Signet 35. I was trying to check the lens with the shutter on bulb. It would not fire without the back on. Replaced the back, then, without thinking, moved it off Bulb with the shutter uncocked. Now the shutter opens and closes as I cock the shutter. I fear I wrecked it. It is the Kodak Syncro 300 shutter, manual shutter cocking. Advice?

Anscojohn, Mount Vernon, Virginia USA