We've been presented with a roll of film for scanning - about 45
years old, Plus-X film that's uncut and tightly wound from being
stored in a canister for all that time.  We're having a hell of a
time getting it straightened to the point where we can run it
through our Sony UY-S90 film scanner.  We've tried washing it,
hanging it with alligator clips to weigh it down, and it was
wound backwards on a Peterson reel for a week, but still no good.  

Any attempt to reverse wind it on a tighter roll tends to crack
the film, so we're looking for other suggestions from people who
may have experience working with similar stock.

The idea of putting it on a flatbed scanner won't work with this
job, since this roll is the first of about 60 rolls and the cost
of flatbed scanning would be prohibitive.

Thanks!