I'm new to this site so bear with me. I have a 6x9 Plaubel pro shift with a 47mm Schneider 5.6. Sharp as a lightning strike and my favorite camera. However, the lens mount is loose, there is a crack in the plastic near the corned of the rising front. It rewinds a little jagged. Shutter needs to be cleaned and calibrated. Is there a repair place that can work on these cameras and also make sure it is in alignment at 5.6 edge to edge after their work? thanks, peter.