So I just got my "new via eBay" Hassey 503cxi - my first foray into MF. So with absolute ignorance and stupidity, I wound the crank on the side figuring to just dry shoot the camera and hear a nice click. Well in wound real nice - but I cannot trigger the shutter! I am guessing it needs a battery? I also have no idea where it would go (this eBay special did not include a manual). I removed the lens and see a small silver button/knob but it doesn't seem to turn. I'm going over to Craig's Camera Manual website now to get a manual - meanwhile, any suggestion on what to do to either get a battery in this (and what kind) and/or get the shutter to fire?