Any progress, Steve?
Why, yes. I have had some progress. Here's what I've found.
I do have to apply significant downward force (approximately 3lbs). A hardwood dowel (square) seems to work OK
Did you notice the page on the right curling up? That wouldn't have happened if I'd built a platen.
You might be curious about how I'm holding the far side of the dowel down:
(I added the red duct tape to increase contrast.)
There is a problem of the edges of the page curling up and obscuring the opposite page (or maybe I should aim the camera better).
4) Nevertheless, the other page image doesn't seem too bad (if you like nude descending a staircase).
Note the dowel is clearly visible at the bottom of the page. I proposed painting this a "distinctive color" to do something like chroma-key post-processing of the image. But I wonder if I could just paint it white and ignore the problem.
Next time I go downstairs, I'll have to photo the book Edge-On to show how even the dowel doesn't completely flatten the pages.
This book may be a bad example. It has some water damage that has riffled the pages. And the margins may be too generous.
Should I address the page curling issue?