<p>Hello! I just a purchased Chinon CM-4 from Ebay. I put the batteries in, and the light meter functions, shutter fires, etc. But, when I look through the viewfinder, there's a small, black squiggly line thing on the middle right side of the viewfinder. When I remove the lens and look through the viewfinder, it's still there. If I'm correct, the speck is either on the mirror or the sensor...? Should I be worried? I have a 30-day return option, but is it worth it? I paid around $30 for it. What should I do? Thanks! :)</p>