I recently received a 500C/M kit that showed evidence of light leaks in the A12 back as well as erratic spacing between shots. There was also no evidence of the Hasselblad notches on the left side of the frame. The back was repaired (by qualified repairman in NYC) and apparently it had problems with the film being held in place by the clip and light leaks. The film now loads much easier and does not pop out of the clip while loading and the two notches appear on the left of the negatives. The rest of the square corners are now perfectly square but I was wondering about the other notches I've seen on Hasselblad corners. This back does not seem to produce them now that it's been fixed. There were some notches before the repair was done on 2 of the corners. Can anyone point me to what a full negative might look like? Have there been different designs for these notches over the years. Is it possible that this back may not have any when it's aligned properly? Also the spacing between shots is still pretty erratic. Should this have been fixed as well? Thanks very much for insight into the shape of the Hasselblad raw negative.