I just bought a Mamiya Press Universal, and I'm quite happy with it except that the range finder is off. I took some pictures of meter sticks at 45 deg to the film plane to figure out what's wrong. It looks like the distance markings on the lens are OK, but the range finder doesn't agree with them. The range finder indicates a distance of 1.7m when it should be indicating 2m. Would this be a simple thing to adjust, or should I send it out to somebody? Can you reccomend somebody who works on these cameras?