If you can't preview the film, here's another idea:
It's a gadget that's used for editing. You mount the film on one side and thread the film through to an empty reel on the other side. Then you turn it by hand slowly and can view the film on a small "lighted window" in the center. That's the way I remember it. And they used to be relatively inexpensive. With some practice, you might even be able to do your own editing if you decide it's needed.
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