Hello everyone, I just recently acquired a Mamiya RB67 with a CDS prism finder. It had some corrosion in the battery terminal which I cleaned out with vinegar so it's good to go. I put some new SR44 batteries in and pressed the battery check button and the green light came on, which I was very relieved! The problem I'm facing is that when I turn the meter on, the needle doesn't move one bit regardless of what ISO/shutter/aperture combo I put in. I'm thinking it might be a wire issue with the needle but I'm not sure. Does anyone know what could be causing this?