I was just given a very beat-up 4x5 Crown Graphic, and I'm excited to try my hand at shooting large format. However this camera has some issues. The lens (an Ektar 127mm f4.7) has heavy cleaning marks, the rangefinder seems to be out of calibration, the spring back was cracked (but I managed to fix it with JB-weld), it's missing a few screws, and the inner yoke guide rails (I think that's what they're called?) have snapped and need to be replaced, among other things. Is there a good source for replacement parts for these cameras, besides ebay?