Yeah, make sure you close the shutter after focusing and pull the darkslide before making the exposure. As far as the shutter unless your absolutely sure that it is dead I'd send it off to Carol Miller at Flutot's. She is usually backed up and you'll have to get on her wait before you send the shutter in, but her prices are super reasonable and she has worked wonders with some of my shutters. As far as a new shutter check Badger Graphic Sales, bought a Copal #0 from them not to long ago for a 150mm G-Claron I got in barrel.

Roger