I have a Sonnar 150 lens, whose flash sync seems to be faulty. Although, it will work if I apply pressure to it with my finger while i press the shutter. This obviously won't fly for any kind of shooting that requires both hands. I use the lens on a Hasselblad 500 C/M, and was wondering if the flash sync socket on the body will work as a replacement. The flash does fire when I use it, although I'm not sure if it is in sync with the shutter in the lens. Has anybody used this socket bofore instead of the one on the lens? Also, would the one on the lens be expensive to fix? Thanks for any help you can offer.